a game with no turnovers and no punts. this season, jayden daniels has done it three times, and for those die hard redskins now commanders fans, it has been 19 long years since your beloved team made it this far. whether or not they beat the lions this weekend. congrats. you are back, baby. all right. that's great. >> that's great. >> it's really great. it sure is. all right. pablo. david. chris chris, thank you both so very much. and for you at home i wish you a good night. remember, you can catch the nightcap again on saturdays at 11 p.m. eastern right here on msnbc. if you love tonight, watch it again tomorrow. tell a friend. but for now, from all of our colleagues across the networks of nbc news. thanks for staying up late. i'll thanks for staying up late. i'll see you at thanks for staying up late. i'll see you at like, how would this happen to me? i would never imagine that i'd be in this position. people aren't waiting for facts to come out.

she was so healthy. healthy people don't just drop dead. nobody could do anything. there's someone who deliberately did this to mary, because so many poisoned mary. so many things start gelling to make us suspicious. it always seems to be the spouse is the one responsible. they were sure my father had done this. the poison is in his jeep. yes. they had asked me flat-out, do you think adam could have killed his mother? they're interrogating her for murder. if you could have seen what they put that girl through. you feel like all of a sudden, somebody dropped you in the middle of hell, and you can't find your way out. [theme music] [gentle music] andrea canning (voiceover): she was the kind of doctor who went above and beyond. kaitlyn conley: the patients loved her. they didn't just see her as a doctor. they saw her as a mentor and as a friend. andrea canning (voiceover): and as an example.

at 60 years old, mary yoder, a popular chiropractor, was the picture of health. she was extremely healthy. - she was fit and beautiful. - yeah. - she ran-- - triathlons. --triathlons. [laughs] andrea canning (voiceover): energetic, vibrant, until mary the doctor was suddenly a patient in the icu. throughout the night, she starts coding. the hospital has to bring her back each time. they had every specialist. they had everybody there trying to figure out what was happening. andrea canning (voiceover): one rare blood test would eventually solve the medical mystery, but it opened the door to a new one, the evil kind, the kind of case where nothing was what it seemed. it was so surreal. i didn't even know how to handle it. andrea canning (voiceover): a surprising romance, an anonymous letter, and a twisted trail that would lead to the unlikeliest of suspects. we felt that whoever wrote this letter was probably our killer.

there were so many twists and turns in this case, someone could write a book and make a lot of money. andrea canning (voiceover): mary yoder was the shining light in her family. she grew up in upstate new york with two brothers and five sisters, including sallie, janine, and sharon. what was she like as a sister? loving a darling. she was always upbeat and full of fun. andrea canning (voiceover): they loved mary because she was up for anything with eclectic hobbies. she was an avid gardener, a musician. here she is singing a duet with sallie. (singing) and so much has already been said andrea canning (voiceover): and sallie also got her sister into this. andrea canning: oh, belly dancing! we costumed and choreographed a dance for a local hafla, which it's an egyptian dance. yeah. andrea canning (voiceover): it was in the '70s in college when mary met bill, who had become her husband.

they chose to pursue holistic living and, you know, healthy lifestyle and spiritual growth. andrea canning (voiceover): the sisters say bill was more introverted than mary, an intellectual. he was seemingly very soulful, which is what mary liked, you know, very deep. very deep. very deep thinker. andrea canning (voiceover): bill earned a phd in philosophy and took courses to become a chiropractor, which got his wife, thinking-- and mary decided, you know, i'm smart enough. i'm going to be a chiropractor, too. so at that point, then they, you know, decided they'd go into business together when they graduated. andrea canning (voiceover): they opened a chiropractic clinic and started a family. liana is the oldest, born a year after they married. they had started very young, and they were two broke kids at that point. and they were trying to figure out life. andrea canning (voiceover): tamaryn is her younger sister. two years later, i came along. and then 10 years after me, adam came. we adored him. yeah, and he was ours.

i mean, we cuddled him. we held him. andrea canning (voiceover): the yoder family was always close, and when adam was older, he helped out at the family business. then his girlfriend, katie, took his place as office manager. i would schedule patients and greet them. andrea canning (voiceover): katie had a particularly strong bond with mary, considered her a mentor. kaitlyn conley: you couldn't help but to like her. did you feel inspired by her at all? yes, i did. she always kept such a positive outlook, no matter what was going on or what was happening in her day. and that was really encouraging. did she do any work on your back? yes. [laughs] i got chiropractic adjustments. andrea canning: yeah? andrea canning (voiceover): mary was also a big believer in herbal supplements. she took them herself and recommended them to the people she treated. she was always trying to encourage people to live a better life. andrea canning (voiceover): by 2015, mary and bill started to slow down, thinking about retirement. they were planning their trip of a lifetime.

where were they going to go? europe, and that was their plan going up into this trip, is let's decide what our next chapter in our life is going to be together. andrea canning (voiceover): it was also around that time, an afternoon in july, that mary came to her sister, janine's, house out of the blue. mary stopped by to see you. you know, mary and i would get together periodically, but never in all the 20 years that i'd been there did she ever just pop in. i was really surprised. and but i had the impression she wanted to talk. andrea canning (voiceover): but instead, mary cut the visit short and left quickly. and she said, no, no, i gotta go, but she said, there's no reason that we can't make a habit of this. and so i said, ok, great. andrea canning (voiceover): it all puzzled janine. she wondered if mary wanted to confide in her about something but got cold feet. then, just a week later, mary got sick, very sick, and it came on fast. her day began with a full schedule at the clinic.

but holly hiltz, a patient, noticed something wasn't right. she just had redness around her eyes, like when you're getting a cold. but, you know, we just thought, ok, she's human. she gets sick, too. andrea canning (voiceover): it turned out she wasn't just sick. mary was violently ill with vomiting and diarrhea. bill rushed her to the hospital. that's how i woke up, was the phone call from my father. and he just was-- just on the phone, just, mom's really sick. andrea canning (voiceover): what was wrong with mary? coming up, an illness that was baffling even to doctors. they had everybody there trying to figure out what was happening, and nobody-- nobody could do anything. andrea canning (voiceover): when "dateline" continues. long after guests leave, viruses and bacteria linger. air fresheners add a scent. but only lysol air sanitizer helps erase the trace, eliminating odor and killing 99.9% of viruses

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had been feeling perfectly fine when the day began. now she was in the icu, fighting for her life. tamaryn called me, mary's daughter. and told you mary was sick? yes, she said mary's in the hospital. and she was desperate on the phone. and i was like-- i was like, well, mary is the healthiest woman i know. she's got to be-- i just said, tamaryn, everything will be fine. everything will be fine. andrea canning (voiceover): but when mary's sisters got to the hospital, they realized how bad it was. we went to the hospital, and it was just-- it was crazy. they were-- they no idea what was wrong. andrea canning (voiceover): mary's daughter, tamaryn, was in the room as her mother started to code. every time her heart would stop and they would revive her, she would come back, and she would be responsive again. and she would-- she was intubated, but she could still mouth "i love you" around it. andrea canning (voiceover): daughter liana, a physician herself, was racing to the hospital as a team of specialists was brought in. andrea canning: you must have felt so helpless being the doctor of the family,

and you're not-- you're not there. 'cause they had everybody there trying to figure out what was happening, and nobody-- nobody could do anything. they brought in so many specialists. they had no idea. you know, they just couldn't figure out what was wrong with this woman. andrea canning (voiceover): mary's sister, sharon, is a nurse. she was down in florida getting updates. sharon mills: janine said that she had coded three times, and i just knew that wasn't good. so i called my husband, who has more experience working in the hospital than i do. and he said, you need to be prepared. this isn't good. this is a medical mystery. yeah. no one-- no doctor is coming out and telling you, here's what she has. here's what-- how we're-- - no, no. --what we're doing about it. no idea. andrea canning (voiceover): a family vigil was underway in the waiting room, and hours later, the horrible news came. andrea canning: and so, it was on july 22-- yep. --2015. sallie bakert: yes. janine ended up telling me, calling me and saying, sharon, she's gone.

and i just remember, like, screaming and banging on the steering wheel. and i said, janine, 60-year-old healthy people don't just drop dead. andrea canning (voiceover): katie, the office manager, was there, too. andrea canning: what was the mood like when they all finally learned the news? they were devastated. it's unimaginable. andrea canning (voiceover): katie, who had always looked up to mary, said she was heartbroken. it was completely shocking. it was surreal. because how could this person who was so full of energy and so vibrant just be gone so suddenly? i remember at the time saying, i don't understand this. if there had been a car accident or something, that i could understand. but i don't understand this. how a healthy-- yep. what happened for her body to just quit? just shut down. because it made no sense at all. andrea canning (voiceover): a few days later, daughter liana got a call

from the medical examiner. and he said, based on the severity of how quickly this illness hit her and the fact that it looked like it was an infectious cause with a high white blood cell count and her gallbladder being inflamed, we think it's something called colitis or ascending cholangitis. and this is what you told your aunts? this is what i-- andrea canning: that you believed. yeah. that's the most you had to go on. that was-- at that point, that was the most we had. andrea canning (voiceover): it looked like mary had died from some kind of serious infection. so then we're thinking, ok, well, i guess it was natural causes. andrea canning (voiceover): sharon, the nurse, was confused. sharon mills: i said, it makes no sense to me. but she told us that, so we accepted it. and it wasn't easy because we didn't understand it. andrea canning (voiceover): sharon suggested to liana that the medical examiner should do toxicology tests just in case. she did say that they are going to do the toxicology tests that you asked for. and i said thank you.

andrea canning (voiceover): a month went by. the toxicology report hadn't come back. that's when janine happened to run into one of mary's doctors. he told her something that surprised her. they had already decided it was not an infection. he goes, we have no idea how she died. he said so many specialists were called in. we'd never seen anything like this in all of our years of practicing. you had no idea about any of this. no, no. and so we-- that's just so many things start gelling to make us suspicious. andrea canning (voiceover): so the medical mystery was only deepening. we always-- from the moment mary died, in our gut, we felt something's not right. something's not right. in what way, like foul play or that-- well-- --something went wrong? just to feel the sense that, yes, something's not right here. andrea canning (voiceover): it would turn out something wasn't right at all. coming up, doctors make a discovery-- a mysterious medication. there's a safe and effective dose and then a toxic dose.

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premium gives you early access and ad free listening to rachel maddow chart topping series, msnbc original podcasts, exclusive bonus content, and all of your favorite msnbc shows. now ad free. subscribe on apple now ad free. subscribe on apple podcasts. andrea canning (voiceover): in the wake of mary yoder's death, sadness rippled through her upstate new york community, as office manager, katie, had the grim task of calling mary's patients with the news. what were the responses you were getting from people? people were shocked for her to just be gone so suddenly and after such a brief illness, that people couldn't believe it. and i didn't have any answers for them. andrea canning (voiceover): one of the people katie spoke with was holly hiltz, the patient who saw mary the day she fell ill. i'm like, what? how can that be for somebody that is that healthy? andrea canning (voiceover): mary's family was devastated, but at the memorial service, her sisters thought bill was handling the loss better than they expected.

when i saw bill, we locked in a long hug. i was sobbing, and it felt and sounded like he was sobbing, too. and when we broke from our embrace, there were no tears. but there were other people there that day that were saying, oh, yeah, bill-- oh, he was crying. he was sobbing hard. andrea canning (voiceover): and as time passed-- we assumed that our brother-in-law was going to completely fall apart without mary. and he really just didn't seem like the grieving partner that, you know, we were expecting. andrea canning (voiceover): the grieving sisters had so many questions, and the medical examiner was still working, trying to figure out mary's cause of death. it was proving difficult. they really had the ability for one more test. andrea canning (voiceover): dr. jeanna marraffa is an assistant clinical director for the upstate new york poison center. when the me only had one blood sample left, he contacted her. and that was really what they came to me with. is there anything that you could think

of that we could test for? andrea canning (voiceover): it was a roll of the dice, but she suggested checking for one particular drug. her symptoms really led me down the line of thinking that colchicine was very high on my list as potential causes. andrea canning (voiceover): colchicine is a drug that's used to treat the disease gout, a form of arthritis. in a high enough dose, it becomes toxic. and that toxic dose can result in anything from significant severe side effects to fatality. andrea canning (voiceover): and the final test proved it. the medical examiner called mary's daughter, liana, the physician in the family. it was like, ok, we did get a cause of death back. it's colchicine. i said, what? she's like-- repeated-- it's colchicine. i'm like, the gout medication? i was completely confused. i mean, the only capacity that i knew that was as a short-term acute treatment for gout.

which we knew our mother didn't have. didn't have. i was like, what? well, how did she get it? and she didn't know. so i said, so she was poisoned then? and she said, well, we have to find out how it got into her system. where's your mind going now? are you thinking foul play? i was the first one to take that leap i was the first one. i was just getting all these bits and pieces of information, and it was not making sense. did you feel like you were playing armchair detectives, trying to-- sharon and i-- --cut through everything to figure out what really happened? yeah, yeah. andrea canning (voiceover): weeks went by. then, three months after mary's death, sharon decided to call a real detective. we get a phone call. andrea canning (voiceover): mary's sister spoke to lieutenant robert nelson. he was a detective with the oneida county sheriff's office. robert nelson: she asked if we would get involved in the investigation to determine how mary got this in her system. do you feel that this is something that would fall under your purview? yes. at this point, we were like, well,

we need to get a hold of the me's office to see exactly, you know, what they have. what did they rule as the cause of death? andrea canning (voiceover): the detective learned there was nothing in mary's medical history to explain why she'd be taking colchicine. andrea canning: so why would she have this poison, this drug in her system? that they didn't know. that's when they started looking at different things. she took all these supplements. they looked at supplement contamination. andrea canning (voiceover): mary's son, adam, and katie gathered her supplements to have them sent for testing. anything there? never. we finally got the test back from there and nothing. - negative? - negative. andrea canning (voiceover): but there was another possibility, too. colchicine comes from a plant called autumn crocus, and mary was an avid gardener. autumn crocus could be mistaken for wild garlic. so if she had taken the leaves off or boiled the bulbs in water and somehow ingested it that way, that would cause the colchicine toxicity. this is a deadly plant. yes, it can be. did she have autumn crocus in her garden? no, they looked at that and there was none of those plants

in the garden. how much colchicine do you have to ingest for it to be deadly? if you're talking gout medicine, it's like, you'd have to take anywhere from 40 to 60 pills depending on your size. you'd have to take it all at once to be a lethal dose. andrea canning (voiceover): if mary did take that many pills, maybe she did it on purpose. we talked to the family. we started talking to people. we don't believe it's suicide. andrea canning (voiceover): that left one other scenario, a disturbing one. andrea canning: did you think that she could be poisoned, given just-- never, no. the violent nature of it? [sobibng] it was just because the thought of anybody doing that to her, it just-- to her. andrea canning (voiceover): but that's exactly what the detective was considering. did somebody poison mary? did somebody deliberately give this to mary? we sat down with the me's office and went through everything of the autopsy. at that point, we were looking at it as a homicide. andrea canning (voiceover): now the hunt for a killer was on, and some of mary's sisters thought they knew where investigators should start.

coming up. she says, i think he's got a girlfriend. andrea canning (voiceover): mary's husband, bill, and a mysterious other woman. we begin to wonder, was there a relationship beforehand? andrea canning (voiceover): when "dateline" continues. dry eyes still feel gritty, rough, or tired? with miebo, eyes can feel ♪ miebo ♪ ♪ ohh yeah ♪ miebo is the only prescription dry eye drop that forms a protective layer for the number one cause of dry eye: too much tear evaporation. for relief that's ♪ miebo ♪ ♪ ohh yeah ♪ remove contact lenses before using miebo. wait at least 30 minutes before putting them back in. eye redness and blurred vision may occur. ♪ miebo ♪ ♪ ohh yeah ♪ ask your eye doctor about prescription miebo. i am obsessed with olay's retinol body wash. with olay retinol body wash, 95% of women had visibly renewed skin. makes my skin feel so smooth and moisturized. olay body wash & lotion.

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this skinny pop is amazing. and only three simple ingredients. we never have to stop. we never have to stop! hey guys i picked up some... surprise! skinny pop. endlessly delicious. richard lui with a news update. israel's cabinet approving a cease fire deal. but airstrikes continue in gaza, killing dozens. the hostilities are set to end sunday, when phase one of the agreement kicks in and involves hostage and prisoner swaps and a surge in humanitarian aid for palestinians. and president elect donald trump, announcing his inauguration on monday, will take place indoors due to the extreme cold. the ceremony will take place in the capitol rotunda. the new york times reporting former vice president mike pence will attend. now back mike pence will attend. now back to dateline. andrea canning (voiceover): it was four months after mary

yoder's death, and investigators told the family they were convinced mary had been murdered. andrea canning: what is that moment like when your mom is now-- why? andrea canning: --a murder victim? there isn't even words for it. your world flips upside down, and nothing makes sense. and up isn't down, and down isn't up anymore. so that was terrifying. andrea canning (voiceover): and mary's daughters believed their mother hadn't just been killed-- she'd practically been tortured. colchicine, one of the hallmarks of it, it stops your heart. it breaks m and it breaks it over and over and over again. andrea canning (voiceover): detective robert nelson was trying to figure out who might have used the drug to poison mary. there were actually a couple of tv shows that kind of echoed this case. yes, there was the tv show "house," which had colchicine. but this is real life now. yes. did a patient come in that day and do something that we don't know about? did they give mary, you know, something to eat? any obvious suspects, potential suspects?

no, not at first. andrea canning (voiceover): but detective nelson had to start somewhere. what about the person closest to mary-- her husband? andrea canning: what was it that was leading you in bill's direction? at this point, basically, just because he was the husband. in these types of cases, it always seems to be the spouse is the one responsible if it's a poisoning case. andrea canning (voiceover): mary's sisters had known bill for decades. if there were problems in the marriage, was mary the type to share with her sisters? she would talk about frustration in certain situations, but she tried very hard never to say anything negative about bill. no, she always put a positive spin on anything if she could. still, her sisters never forgot a story mary told them. it happened before the time of her wedding, 38 years earlier. they're out in my parents' yard, and bill says to her, you know this is to be an open marriage, right? and she was taken aback. she said to me, i had the strength to tell him, no, bill, we're going

to have to not get married, you know, if you can't commit to monogamy. he backed down? yeah, he came back and said, ok, i've thought about it, and i can commit. andrea canning (voiceover): but did he? it was no secret that in the years that followed, bill would often disappear on weekends. he'd take night trips to albany, weekends to be by himself, he said, to write. andrea canning (voiceover): janine kept wondering about that day mary dropped by her house out of the blue. did she want to tell her something about her marriage? i think she wanted to talk or she wanted to open up the door, you know, for us to start talking about something. andrea canning (voiceover): the sisters also thought back to bill's behavior, how he seemed so unemotional to them after mary's death. janine bakert king: well, some of the things that we weren't comfortable with was that they didn't know what she died of exactly, but he had her cremated very quickly. he had her phone turned off very quickly. too quickly? yeah, too quickly. andrea canning (voiceover): still, the sisters say the marriage looked pretty solid in recent years. our brother-in-law seemingly became a really good husband.

you know, he was helpful in ways, letting her do things she wanted to do. i was just thinking, well, gee, bill has really come a long way. andrea canning (voiceover): and certainly, no one wanted to believe that mary's own husband would harm her. when i was interviewed, i was not ready to say that i suspect my brother-in-law, because i really had no real evidence. and i felt, in all fairness to another human being, i'm not going to accuse him of something without evidence. andrea canning (voiceover): any fair-minded detective would need that evidence, too, along with the clear idea of a motive. andrea canning: did-- bill stand to inherit everything that was mary's, everything in the marriage? they had the business together. but there was no-- no large sums of money that bill would have gotten in mary's death. andrea canning (voiceover): still, authorities kept tabs on bill, monitoring his behavior. andrea canning: how did you take that, knowing that the police were looking at your dad? it was terrifying. yep. but we didn't understand because there was nothing in their relationship that indicated

that there was any trouble. did you think it was possible just-- we didn't know if our father was involved. we didn't know if it was a complete stranger. we had absolutely-- liana hege: no idea. --no idea. andrea canning (voiceover): detectives told the siblings not to talk about the investigation, especially not to their father. well, we weren't letting him in on the fact-- right. --that we had been talking with the investigators. andrea canning (voiceover): they eventually called bill in for an interview. robert nelson: bill is not an emotional person, so he didn't seem very upset. you know, he wasn't very outgoing in his emotions. he's not shedding any tears or-- well, we're not speaking to bill until five months later after mary's death. andrea canning (voiceover): bill spoke to them for five hours. and he gave investigators permission to search the couple's chiropractic business, where deputies collected computers, a typewriter, and a fax machine. he signed a consent. we went to the office. and he was very helpful. i mean, he was very forthcoming. he gave us everything we asked for.

andrea canning (voiceover): and they had a lot of questions for bill. at the top of the list, something they'd learned while they were tracking him. it turns out bill was already dating again. in fact, it was mary's mother who first called it. shortly after mary died, my mother said, why is he always going out of town? and i said, i don't know. i don't know, mom. maybe he needs some time or whatever. and she says, i think he's got a girlfriend. this was coming from a 92-year-old woman, 91-year-old-- - you know, yeah. and she goes, i'm not feeling right about this. andrea canning (voiceover): detective nelson was the one to tell sharon their mom was right. he told me that they had, in fact, found bill to be with another woman. did he tell you who the other woman was? no, he did not. we began to wonder, was there a relationship beforehand? why is it important to determine now if this relationship started before mary's death? if it was before mary's death, obviously, that would have been a motive. then we would have had to say, well, bill now has a motive for this. that's kind of a big deal. yes, when that came up, that was an obvious red flag.

and we were very concerned about it. andrea canning (voiceover): in his interview with detectives, bill said he had not cheated on his wife. the relationship began after mary died, and phone records seemed to confirm it. we were able to verify all this information that he wasn't having phone conversations, text messages with her prior to mary's death. andrea canning (voiceover): so the obvious suspect, the husband with a new romance, didn't seem so obvious after all. but the detective had a new lead-- a big one-- and it would change everything. coming up, like a bolt from the blue, an anonymous letter lands in their laps. and it would lead to a poisoned piece of evidence. that's your big moment in this case? big, big moment. andrea canning (voiceover): when "dateline" continues. gold bond believes touch says everything. it says... i see you. i feel you.

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on his desk-- an anonymous letter. i received a letter stating that adam did this. he was responsible. he told this person that he did it. andrea canning (voiceover): adam was adam yoder, mary and bill's 25-year-old son. the letter said he was the killer. the person who penned the letter claimed to be close to adam, writing, he got a bottle of colchicine off online and put the toxin in one of her vitamins when he was over at his parents' house. with a jolt, the letter dramatically shifted the focus of the investigation from father to son. you might have a smoking gun here. yes, there was a lot of detail in that letter. did adam have any criminal history? no, we didn't have anything on adam. andrea canning (voiceover): remember, adam dated katie. and her parents, vin and cathy, knew him well. when he was dating our daughter, he would come to the house every day. and how did you feel about the relationship? there was always something off, something

we didn't care for with adam. he was kind of off, detached. we'd eat dinner as a family, and adam would sit across from me and-- he wouldn't make eye contact-- --talked-- --with you, and he wouldn't really talk-- the communication-- --to anyone in the family. --stopped a little bit between myself and him. did you, at any point, feel like maybe i should say something? or did you totally stay out of it? no, we did mention to katie that we didn't think-- there was something different with adam. and we didn't really feel comfortable about it. her sisters also recognized that fact, too. andrea canning (voiceover): shannon and sarah conley are katie's twin sisters. they weren't sad when katie and adam split up. andrea canning: why did they finally break up? katie just had enough of him being up, being down, being up, being down. and just some of the things he would say just weren't right. did adam have any issues with his mom that you know of?

i know they definitely were not as close as our family was. he would just kind of talk down about his family. i was like, i don't get it. like, i've met your mother. she's great. andrea canning (voiceover): so why? if there was any truth to the letter, what motive would adam have? the letter seemed to have an answer. andrea canning: why did it say he did it? he thought he'd gain financially. if his mother passed away, he thought he'd have a financial gain. also, that there was arguments between him and his parents, that he was upset with his mother. so it listed that as the two of the reasonings. andrea canning (voiceover): and the letter told authorities something else. the colchicine container is under the front seat passenger side of his jeep until he figures out where to dispose of it next. what's your strategy going in with adam? we sat down. we talked as to how we want to go about with adam. and we said, let's bring him up here. let's see if he comes up in his vehicle. the letter says the colchicine's in the vehicle. we'll talk to adam. we'll see if he comes up here with the colchicine. was this a bit of a test to see if adam would show up in the jeep? yes.

andrea canning (voiceover): and when adam arrived to talk to the detectives, he was driving the jeep in question. we were trying to get a feel for adam at that point to see, you know, is he responsible for his mother's death? so we spoke to him. we then showed him parts of the letter that said where this colchicine would be, in which he was taken back. what was his demeanor over that letter? shocked. did you feel his reaction was genuine? yes, but we still had some concerns also by his reactions. in what way? he was just hesitant to let us go look in his vehicle. andrea canning (voiceover): while one detective talked to adam, another called his sister, liana. liana hege: they're like, we actually have a letter. what do you mean you have a letter? well, the letter is actually pointing the finger at your brother, and it says that he's got this in his car. and-- the poison. liana hege: this poison in his car. and i said, what do you mean you have a letter that says, my brother did it? and they said, no, it's important. we got to look in your brother's car.

you've got to convince him to let us-- you know, if you can talk to him, let him know. because if he leaves the station, this isn't going to be good. andrea canning (voiceover): adam eventually gave investigators permission, and they went outside to the parking lot. andrea canning: the moment of truth-- you open the vehicle door, and what do you find inside? they go out there, and they search the vehicle right where it says it's going to be in the letter. and we pull out a cardboard sleeve with the colchicine inside the sleeve. andrea canning (voiceover): and just like that, the investigators seemed to have the weapon right in his hand. that's your big moment in this case? big, big moment. andrea canning (voiceover): coming up, adam yoder, secret killer? it was frustrating. it just wasn't fitting. andrea canning (voiceover): this deadly puzzle wasn't solved yet. when "dateline" continues. my mental health was better. but uncontrollable movements called td,tardive dyskinesia, started disrupting my day. td felt embarrassing.

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and locks in moisture to provide soothing relief. a nose in need deserves puffs indeed. america's #1 lotion tissue. . >> work. play. blink. relief. >> work. play. blink. relief. >> the only how are folks 60 and older having fun these days? family cookouts! ♪♪ playing games! ♪♪ dancing in the par... (high pitched sound) (high pitched sound) (high pitched sound)

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the colchicine used to kill mary yoder was under the front passenger seat of her son, adam's, jeep. it was a pure form of the drug, far more potent than what doctors prescribe. and adam? what's his reaction? i think he was shocked at that point when he saw us pull that out. the poison is in his jeep. yes. andrea canning (voiceover): what's more, in the jeep, along with the colchicine, there was a receipt for the drug. and on the receipt-- robert nelson: they had an email address. it also had adam's name on there. and from there, the mradamyoder gmail account, which was very important to us, was listed on there. andrea canning (voiceover): adam said he'd never seen the colchicine before in his life. someone must have planted it. in that moment, what are you thinking? at that moment, we're thinking, would he bring the poison up here with him? i mean, it doesn't make sense. if you killed your mother and you got the colchicine, you wouldn't drive up to the sheriff's office with the colchicine knowingly in your car. you would get rid of it. but again, you have an anonymous letter saying he admitted to doing it and that the colchicine

would be in his car. so you kind of have a split reaction as to which way are we looking at it. andrea canning (voiceover): could adam really have poisoned his mother? when they looked into his whereabouts on the day mary got sick, they discovered adam was more than 300 miles away, visiting his sister. i knew at the time my mom got sick, he was with me. and i couldn't understand. wait, he-- how would he have been involved? my mother was my brother's biggest supporter. he turned to her first for everything. the thought-- them trying to say that he did this didn't make sense. andrea canning (voiceover): it didn't entirely make sense to detectives either. you let adam go? yes. but i would imagine you're not crossing adam off your list yet. no, we were comfortable enough to let him go, but we didn't say absolutely he had nothing to do with it. andrea canning (voiceover): the investigation led them to talk to adam's cousin and roommate, david king. he's the son of mary's sister, janine.

david told them that after mary died, adam was enrolled in college, but his life seemed to be falling apart. he slowly started dropping all of his classes, and he was pretty much staying in bed all day and drinking a lot. were you really concerned about him? i was. he had expressed to me that he was suicidal a couple of times, which was very concerning. andrea canning (voiceover): it was only when detectives were interviewing david that he realized adam was a person of interest in mary's death. andrea canning: did that just floor you? i was absolutely floored. and at that time, they had asked me flat out, do you think adam could have killed his mother? what did you tell them? at the time, i said, no, i don't think he would. at the time. at the time. andrea canning (voiceover): david would later wonder if his cousin's behavior was the result of grief or guilt. adam's sisters, on the other hand, had no doubt adam was innocent. they were convinced he was being framed. who did you think could have framed him?

at that point, a possibility was my father. so you actually believed your father might have framed your brother? we believed it could have been possible. the investigators were leaning very heavy onto it and pretty much telling us, without coming out right out and saying it, that they were sure my father had done this. andrea canning (voiceover): it was impossible to wrap their heads around. this can't be real. this can't really be happening. liana hege: we had a reality check with each other. and you're like, did it happen or did it not? right, was this a dream? what's going on? you feel like all of a sudden, somebody dropped you in the middle of hell, and you can't find your way out. and every time you get an answer, it's worse. andrea canning (voiceover): but detectives didn't have enough evidence to prove any of their theories. it was frustrating. i mean, there was a lot of nights we were frustrated by this case. we looked at adam, but yet nothing else was pointing the finger at adam. it just wasn't fitting. and the same with bill. we'd want to say, ok, bill did this.

but why did bill do it? and so, there was times we were kind of wondering. andrea canning (voiceover): looking for new insight, detectives turned to someone outside the yoder clan-- katie, who dated adam and worked for bill and mary. we just wanted to speak to her to see if she knew anything about bill, about mary other than, you know, outside of the office. often employees are the ones who hear and see a lot. yes. andrea canning (voiceover): katie was in the middle of final exams at college, but made time to come in for an interview. andrea canning: did you wonder why? i wondered what had started an investigation, and i wanted to help in whatever way i could. i just didn't know what they were getting at. andrea canning (voiceover): detectives thought katie could tell them a lot about mary and bill. they were like, night and day. in what way? mary was very outgoing and very vibrant, and bill was more reserved. and-- he was more about the business and less about being friendly with patients.

andrea canning (voiceover): she, of course, knew a lot about adam, too. andrea canning: things weren't perfect between adam and katie. - no. but they clearly had something because they kept going back to each other. yes, they would talk on and off. they would text each other. they would get back together. then they would break up again. andrea canning: did they have a lot of questions? they did. andrea canning (voiceover): investigators talked to katie three times over the next few days. by the third interview, she started telling them the same thing adam's cousin had said-- adam hadn't been himself lately. she makes some comments about adam's acting strangely and isn't acting right. is she worried about adam that maybe adam had something to do with this? yes. she's kind of hinting that, you know, the way adam is acting, that he may be responsible for his mother's death. andrea canning (voiceover): as detectives listened to katie talk about adam, her ex, they wondered where this was going. a light bulb went off for the investigator. he took a shot and said, did you write the letter? and what did she say? she said yes. andrea canning (voiceover): detectives had found the person who wrote that letter

pointing the finger at adam. now, with her cover blown, katie appeared frightened. scared. >> what? i'm scared, i understand that. understand that. >> well, andrea canning (voiceover): through tears, katie went over the details in the letter. she said adam confessed to her. he poisoned his mother with colchicine. andrea canning (voiceover): in the letter, she said adam hid the poison in one of mary's vitamin pills, but katie wasn't sure if he really meant to kill his mother. andrea canning (voiceover): as for how she knew where adam had stashed the poison, katie said he told her when she was literally

sitting on top of it. under his seat? >> under my seat? >> under your seat. >> under your seat. >> he told andrea canning (voiceover): katie had known adam for years, but now she told the detectives she didn't know what he was capable of. andrea canning (voiceover): she said she didn't report adams sooner for one simple reason-- she was afraid of him. >> if you're saying adam is responsible, why would adam come after you? after you? >> why, andrea canning (voiceover): katie's admission

that she was the letter writer seemed like the big break detectives needed. and it was, but not in the way you might think. and you thought that possibly the killer wrote the letter. yes. are you thinking katie could be the killer? absolutely. really? yes. andrea canning (voiceover): key witness or prime suspect-- which was she? as the interview went on, the detectives pushed her harder. wanted us to know. wanted us to know. >> or did is katie starting to panic? did you feel that? yes, i think at this point, she's becoming worried about where things are turning and how it's looking for her. because if we didn't arrest adam when we found the colchicine, now she knows we don't necessarily believe what's in that letter.

andrea canning (voiceover): at one point, katie told the detectives adam had threatened to frame her. going to be me. okay. >> for what? >> for what? so anything we asked her, she says, i know things are pointing at me, but it's adam. she always tried to point the finger back at adam. andrea canning (voiceover): she also said something they thought was just plain weird. she made an observation about who uses poison. andrea canning (voiceover): of course, that didn't prove katie was mary's killer. she was free to go, but she had not done much during that interview to dispel the detectives' suspicions either-- far from it. we wanted to speak to her again. but at this point now, we also had

a lot more police work to do. andrea canning (voiceover): they started to dig and quickly thought they were on the right track. for one thing, katie had opportunity. she was with mary at the office that day. poison experts thought mary had ingested the colchicine around lunchtime. there's a kitchen area in the back where they would sit and have lunch and make their drinks. if mary was out in this other room a couple of offices away working on patients, katie would have the time to go back there and do something. andrea canning (voiceover): and that gmail account that had been used to buy the poison, digital records showed adam's computer had never been used to log into the account, but katie's computer had. katie had accessed the mradamyoder account from not only home, but from the office. andrea canning (voiceover): in fact, the entire digital trail seemed to lead detectives right to katie's doorstep. on her phone, they found several searches for the word "colchicine." all this evidence comes in against her. nothing's coming back on bill, and nothing came back on adam.

andrea canning (voiceover): but there was a gaping hole in their theory. if katie really was mary's killer, why had she done it? the only person who could answer that was katie herself. it was time for another conversation, and this one was going to get intense. [crying] oh, my god. andrea canning (voiceover): coming up. no way. katie? they can't be looking at katie. andrea canning (voiceover): an interrogation-turned marathon. they said, katie will not be going home. never, ever in your wildest dreams would you think that this would happen. [sobs] andrea canning (voiceover): when "dateline" continues. yes yes yes yes yes yes yes yes.

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andrea canning: by all accounts, this seemed like a very nice relationship between a younger woman and an older woman. yes. a mentor relationship. yes. so was this very surprising to you then? absolutely. once she admitted to writing that letter, it was definitely a turn of events for us. andrea canning (voiceover): for two months, detectives followed the digital trail, and it led them to only one conclusion. surprising as it may have been, it was looking like katie was mary's killer. the only thing detectives say they didn't have was her motive. you bring katie in. is this go time? at that point, we wanted to find out why. we had all the other evidence leading to that point that she purchased it. she's the one that poisoned mary. we wanted to know why. andrea canning (voiceover): the conversation started with pleasantries about katie's family farm. andrea canning (voiceover): but the detective quickly got down to business.

and we know that your your phone is used quite a lot for items in this case. >> okay? >> you're the one that purchases, you know, help me. >> i didn't. >> i didn't. >> it's all i her story changed so many times. we caught her in a lot of lies now. andrea canning (voiceover): after a while, they got to the point. want her to get sick or what? i know killers come in all shapes and sizes, but katie does not look like a killer. no, but again, it's poison. and she had made a comment earlier that it's a lady's weapon. andrea canning (voiceover): the detectives kept at it. they questioned her for more than six hours. she never asked for an attorney.

please just tell me why, katie, that we can help you is the only thing left in my life is over. >> they drove me to do this. >> they drove me to do this. katie. andrea canning (voiceover): at one point, she appeared to get sick. [coughing] [crying] robert nelson: at the end, i had her saying a lot of things, but she wouldn't admit to actually why she did this. she would state her life was over, but again, she would try to throw it back on adam. but at this point, everything was pointing to her. andrea canning (voiceover): katie's family was right there at the sheriff's office with her. her parents had driven her there, thinking investigators needed her to sign a quick deposition--

an hour at most. and i went to the window, and i said, my daughter's with, uh-- signing papers. she was supposed to be out half an hour ago. i want to talk to her. and i want her out. i mean, what's going on? andrea canning (voiceover): her parents had no idea she was being interviewed as a suspect. but as the afternoon wore on-- vincent conley: they're not-- signing a deposition. --signing a deposition. they're interrogating her for murder. they're interrogating her. so, then, the door is locked to get to my daughter. i beat on the door. wow. and finally, a sheriff came in. and i says, my daughter's in there. i says, i want her out now, or i want to go in there. something's wrong here. andrea canning (voiceover): it was evening when a detective appeared. he comes back out. kathy and i are at the door. katie's not with him. [crying] and he said, katie will not be going home.

cathy conley: with you tonight. she is responsible for mary yoder's death. cathy conley: we know that she did it. she's killed. we know she did it. she'll be spending the night in jail. my wife passed out. she did everything but passed out. i called her. and then he closes the door. was this the most helpless you'd ever felt in your lives as parents? that you can't help your child, that you are not in control, that you have absolutely no way to put your arms around her and tell her everything's going to be ok. andrea canning (voiceover): despite what the detectives said, they didn't charge katie that night. she came out badly shaken. the conleys helped each other to the car and headed home. katie was sitting in the back seat. and don't ask me. this is the hardest question i've ever asked anybody in my life, ok? i says, katie, did you kill mary?

did you kill mary, katie? and without hesitation-- she says, dad, i-- i loved her. i-- i won't kill anybody. andrea canning (voiceover): it was the answer they expected, of course. they say the daughter they raised was no killer. as a mother, you always think that you're going to get a phone call, that your child has been in a car accident, or that there's an illness. but never, ever in your wildest dreams would you think that this would happen at all. it's not-- it's not our daughter. andrea canning (voiceover): katie's sisters felt the same way. the big sister they'd looked up to loved animals, would never hurt anyone, least of all, mary. katie had nothing to gain from her death and everything to lose. she lost a mentor, a best friend. no motive, no gain, nothing.

i know her. i know my sister. katie did not do this. andrea canning (voiceover): in fact, as word traveled that katie was the new target of the investigation, no one could make sense of it. not mary's patient, holly hiltz. andrea canning: did you believe it? no, not at all. from what i know of katie, there's no reason that she would have done something like that. andrea canning (voiceover): mary's own sisters, who had roped the authorities into the investigation, didn't believe it either. no way. katie? they can't be looking at katie. - so we-- - that's what we're thinking. right. andrea canning (voiceover): they phoned the sheriff's office to say there must be some mistake. we all called them and said, you know, look, we hear there's another suspect. if by chance that other suspect is katie, please consider the possibility that she may be being framed. andrea canning (voiceover): even mary's daughters were at a loss. how could this be? how could she-- what do you mean? it was just shocking. it was the hardest person to even wrap your head around

that could be involved. what did your dad say when he heard katie was being looked at as a suspect? he couldn't believe it. andrea canning (voiceover): but investigators were convinced. were you confident you had the killer? oh, absolutely. we had the right person. everything we had, we had the right person now. andrea canning (voiceover): and a grand jury agreed. four months later, katie conley was charged with second-degree murder. the investigation had its surprises, but it would be nothing compared to the drama of the trial. ladies and gentlemen, hell hath no fury like a woman scorned. vengeance, thy name is kaitlyn conley. [tense music] andrea canning (voiceover): coming up. it's hard to know that i'm innocent and still feel like people want me to be guilty. you do feel that way? i feel like people aren't waiting for facts to come out.

andrea canning (voiceover): what could be katie's motive for murder? prosecutors come up with a doozy. laurie lisi: was she helping you through your grief? yes. kaitlyn conley wanted adam yoder back. andrea canning (voiceover): when "dateline" continues. what are folks 60 and older learning these days? new perspectives! ♪♪ how to fix things. ♪♪ fun recip... (high pitched sound) (high pitched sound) (high pitched sound) jordan's sore nose let out a fiery sneeze, so dad grabbed puffs plus lotion to soothe her with ease. puffs plus lotion is gentle on sensitive skin and locks in moisture to provide soothing relief.

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andrea canning (voiceover): when we met her, katie conley had been living under house arrest for several months, confined to her parents' farm, tethered to an ankle monitor. what do you miss the most about not being able to leave your house? i miss being able to get in my car and go to the grocery store or go apple picking with my sister. i miss the freedom that everyone takes for granted, that you can walk out your door. and that's not a reality for me right now. so your home has kind of become your own prison, in a way. yes. andrea canning (voiceover): katie's lawyer wouldn't let her answer our questions about the evidence in the case. lawyer: nope. no? ok. andrea canning (voiceover): but she did tell us how much she missed mary yoder, her boss and friend. andrea canning: would you ever have any reason to do anything to mary? no, no reason ever. we never had so much as a cross word with each other. did you poison mary yoder? no.

andrea canning (voiceover): at times, katie seemed overwhelmed by the upcoming trial. i'm sorry. [breathing shakily] andrea canning: you're ok. is it, um-- is it-- sorry. is your anxiety about just what's coming? it's hard to know that i'm innocent and still feel like people want me to be guilty. and you do feel that way? i feel like people aren't waiting for facts to come out, and they're ready to believe whatever they're told. andrea canning (voiceover): oneida county assistant da laurie lisi was confident that the facts would speak for themselves. we knew it was a circumstantial case, which means it's always an uphill battle. but we felt like we could connect all the dots. [soft music] andrea canning (voiceover): the courtroom was packed on the first day of katie's trial. she sat quietly at the defense table

as the prosecution began. the evidence will show that kaitlyn conley-- andrea canning (voiceover): lisi told the jury she had overwhelming evidence that would prove katie poisoned mary, starting with the timeline. one by one, mary's patients from her last day in the office took the stand. was dr. mary appearing to be ill at all in the morning? no, she was not. andrea canning (voiceover): those who had appointments with mary before lunch said she was her usual vibrant self, but her patients in the afternoon-- didn't have the big smile on her face, and it was very apparent that she was not well or something was wrong. hopefully the jury would be able to kind of extrapolate back and say, ok, well, here's when she got sick. let's go back two to four hours. and that brings you right at lunchtime, which is when kaitlyn conley would have had the opportunity. andrea canning (voiceover): all the patients agreed that katie was the only other person at work that day.

so the prosecutor suggested she was the only one with the opportunity to poison mary. the office doors were locked. there were no patients there. she was there by herself, alone. and she could have done whatever she needed to do to put that poison wherever she ultimately put it. i think she coded like six or seven times. andrea canning (voiceover): bill yoder, mary's husband of 38 years, told the jury about mary's agonizing last hours in the hospital. she had a huge tube down her throat and tubes everywhere. she just looked absolutely terrified. andrea canning (voiceover): the prosecutor wanted to quash any lingering rumors that it was bill who killed mary. she said bill was the grieving husband. so immediately after your wife passed away, what did you do? i remember walking out of the hospital door into the sunlight. and the next memory i have after that was i

was sitting on my bed in the dark, just crying and crying. and it hurt so much. andrea canning (voiceover): bill's daughters were relieved their dad had been cleared by investigators. liana testified for the prosecution that he was a broken man after her mother's death. i couldn't tell you the last time i ever saw my father cry. but since then, every day, pretty much i saw him crying. andrea canning (voiceover): the prosecutor said it couldn't have been bill. there was so much evidence katie bought the poison. she was the one who searched for colchicine on her phone. and both katie's work computer and work typewriter had been forensically linked to the order. imagine that. you're purchasing colchicine to kill your employer, and you're doing it while you're at work.

that, ladies and gentlemen, is cold. it was for 1 gram of colchicine. is that correct? - yes. andrea canning (voiceover): and this witness, a sales rep for the company that supplied the colchicine, said she spoke on the phone with someone at the yoders' practice. can you describe that individual's voice? it was a female's voice. it was soft. it was-- it's soft, sweet voice. sound old or young? young andrea canning (voiceover): soft, sweet, young. who else could that be? asked the prosecutor. but perhaps the most damning evidence was something katie told detectives. the colchicine was purchased with prepaid credit cards. and in katie's police interview, she admitted to buying those cards. andrea canning (voiceover): the prosecutor said it had all taken months of painstaking planning.

but the question hanging over the courtroom was why. maybe the email account used to order the poison offered a clue-- mradamyoder@gmail.com, the name of her ex-boyfriend. laurie lisi: kaitlyn conley wanted adam yoder back. and i submit to you she poisoned adam yoder's mother, her boss, in hopes of bringing adam yoder back to her. laurie lisi: your honor, the people call adam yoder. andrea canning (voiceover): adam told the jury that if katie was trying to woo him back, her plan worked. he called katie on the way to the hospital. laurie lisi: and why did you call katie conley? because i was panicking, and katie knew my mother. andrea canning (voiceover): adam said after his mother passed away, he and katie got back together. laurie lisi: did you have sexual relations with kaitlyn conley on july 25, 2002? i did.

laurie lisi: was she helping you through your grief? yes. andrea canning (voiceover): but the prosecutor said the relationship collapsed a couple of months later, and that's when katie came up with a new plan-- frame adam for the killing. because, ladies and gentlemen, hell hath no fury like a woman scorned. vengeance, thy name is kaitlyn conley. andrea canning (voiceover): the prosecutor said katie planted the bottle of colchicine in adam's car, then tipped off authorities-- something she denied in her interview. andrea canning (voiceover): but a forensic scientist testified adam's dna was not on the bottle's wrapper. katie's was. the major contributor on that cardboard wrapper matched the dna profile from kaitlyn conley. andrea canning (voiceover): it was an outlandish crime, the prosecutor said. so cruel, so cold. her ultimate revenge was not only to take away his mother,

but to make it look like he was the one responsible for it. i think she was hoping that he would figure out that it was her, and there would be nothing that he could do about it. that law enforcement would have honed in on him, he would have been their prime suspect. maybe they would have arrested him right away, and she would have gotten away with murder. but he would always know that it was her. do you believe katie conley killed your mother? absolutely. yes. yes. there is no doubt. andrea canning (voiceover): but katie's defense said they were wrong. far from being a criminal mastermind, it was katie who had been framed, and a surprising relationship was about to be exposed. andrea canning: what's going through your mind when you learn of this relationship? unbelievable. andrea canning (voiceover): coming up-- he was kissing her, and it was very intense. andrea canning (voiceover): a bombshell explodes in court. mary's husband and mary's sister?

that's when we really started thinking seriously that bill did it. andrea canning (voiceover): when "dateline" continues. i'm getting vaccinated... ...with pfizer's pneumococcal pneumonia vaccine. so am i. because i'm at risk for pneumococcal pneumonia. i'm getting prevnar 20 because pneumococcal pneumonia could put me in the hospital and my risk is 6 times greater because i'm over 50. the cdc just expanded its recommendation for those 50 or older to get vaccinated. you're also at risk if you're 19 or older with certain chronic conditions. prevnar 20 is proven to help protect against both pneumococcal pneumonia and invasive pneumococcal disease in just one dose. don't get prevnar 20 if you have a severe allergy to its ingredients. a weakened immune system may lower your response. common side effects include injection site pain and swelling... ...fatigue, headache, muscle and joint pain. millions have chosen prevnar vaccines, which have

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three of mary's sisters. she's on trial for murdering your sister, and you're standing behind the defendant, the alleged killer. the defense, i know. it is a very unusual situation. [chuckles] right, but we just felt like this is the last thing our sister would have wanted. andrea canning (voiceover): but there was another sister who wasn't sitting on the defense's side, a sister they didn't talk to anymore. her name is kathy. and it turns out she is the woman. bill started dating so quickly and some said so suspiciously after mary's death. sharon was the first to figure it out. kathy had been hard to get a hold of in the weeks after mary died, and bill had been going out of town. i said, oh, gee, maybe they're off together, just kind of throwing it out there flippantly. and janine went, do you think? [gasps] what's going through your mind when you learn of this relationship? unbelievable. yeah. i mean, that's when we really started thinking

seriously that bill did it. andrea canning (voiceover): and that's exactly what the defense wanted the jury to think. you will find motive through the testimony on the part of william yoder. andrea canning (voiceover): in court, katie's attorney, christopher pelli, told the jury that mary's killer wasn't katie. it was bill. he really is the only person that i can, in good heart and faith, say had motive to actually kill his wife. andrea canning (voiceover): according to the defense, bill was no grieving widower. christopher pelli: do you remember the first time that you had sexual relations with kathy richmond? i don't remember the date. no. i wasn't keeping a journal. andrea canning: bill said in court the same thing his text messages seemed to confirm for detectives. the romance with his wife's sister only started after mary died. and that's what kathy said, too, when she

was asked the same question. the romantic relationship began sometime in september, late september, mid-september. andrea canning (voiceover): but this woman, one of kathy's neighbors, told a different story. she said she'd seen the two kissing on kathy's porch 'a couple of weeks before mary's death. bill was holding kathy, and he was kissing her and looking in her eyes. and it was very intense. andrea canning (voiceover): the defense said not only did bill have a new relationship, he'd just received a big pile of money, too. i have to ask you how much you inherited, in total, from your father's estate. about $400,000. andrea canning (voiceover): in the eyes of the defense that made mary expendable. janine bakert king: mary had been the primary breadwinner for quite a long time. he'd gotten an inheritance. now he no longer needed mary. andrea canning (voiceover): and the defense wanted the jury to know that bill never

called for an investigation. bill is at fault for not going to the police. andrea canning (voiceover): so if bill had motive, did he also have opportunity? bill denied he was in the office the day mary got sick. remember, her patients hadn't seen him. but katie's defense said that didn't mean he wasn't there. this witness used to work with bill at the office. christopher pelli: do you remember specifically ever being told, i don't want anybody to know that i'm here? sometimes he might say, you know, don't let-- don't tell the patient i'm here because they might want to see me. andrea canning (voiceover): the defense also suggested bill had a second opportunity to harm his wife when he was by her side at the hospital. toxicologist jeanna marraffa told the jury she couldn't rule out that mary got a second dose of poison. if there was a second dose, then there's no possibility, no possibility that kaitlyn could have been involved because she didn't have access to mary

at that particular time did you feel that this case was just swimming in reasonable doubt? i felt like i was drowning in it. andrea canning (voiceover): the defense told the jury there was an innocent explanation for much of the state's case against katie. katie's dna had been found on the colchicine bottle, but as office manager, she handled everything delivered to the practice. as for the sales rep who said she'd talked to a woman with a sweet, young voice-- dr. mary yoder is rather soft-spoken and young-sounding and very vibrant herself. andrea canning (voiceover): and think about this, the defense attorney told the jury-- bill had access to katie's work computer and office typewriter. if bill were to frame katie, you believe it wouldn't be all that hard. no. i mean, katie worked at the office. he would have been able to control these very-- very important circumstances that led to her being charged.

andrea canning (voiceover): but what about those searches for colchicine on katie's phone? andrea canning: how do you get around that? she's looking up this very rare drug that i had never heard of until i started working on this story. the prosecution couldn't say that katie searched this particular term prior to mary's death. it appeared that it was afterwards. andrea canning (voiceover): the defense said the evidence against katie wasn't there. and the state's motive? preposterous. the idea that katie killed mary to get back together with adam didn't make any sense, he said. according to her sisters, she was the one who initially dumped him. finally, she just had enough. she didn't want to be with him anymore. andrea canning (voiceover): as for the anonymous letter pointing the finger at adam, the defense never explained why katie wrote it if bill was the real killer. but he wanted the jury to see the lengths katie had gone to help the investigation, enduring hours of intense questioning. you wanted the jury to know how cooperative katie

was with the authorities. yes, i did. she had the opportunity on, i believe, seven different occasions to say, you know what? i think i want an attorney. but instead, she continued to cooperate and be subjected to some pretty severe interrogation tactics. you told the jury that this was basically a seven-hour documentary on how to get a false statement? i did. what did you mean by that? the police used every tactic that they could to elicit some type of guilty response. andrea canning (voiceover): that's why the defense said the jury should ignore anything katie said during that interview. do you think that your daughter, your 23-year-old, could give an accurate statement under those conditions?

i think not. andrea canning (voiceover): detectives say their techniques were by the book, but mary's sister, sharon, couldn't believe what katie went through. at that point, i wish that i had never called for an investigation. andrea canning (voiceover): sharon was more convinced than ever that katie was innocent and bill guilty. she said as much in open court. it is still my theory that he killed my sister. ok. what if you're wrong. what if she really did do this? have you thought about that? we just-- every once in a while, and it's just so not-- we have tried to wrap our heads around it 1,000 ways to see if there's any way possible that we think she could have done this. and it just doesn't make sense. we don't believe she did this. andrea canning (voiceover): but what would the jury think? there was one more surprise to come. coming up. i actually thought that we'd have a verdict in 15 or 20 minutes of not guilty. andrea canning (voiceover): deliberations defy predictions.

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♪what a wonderful world♪ ask your doctor about once-daily trelegy for copd because breathing should be beautiful, all day and night. i've got to get marcus some new cleats i bet you can buy the whole team new cleats because breathing should be beautiful, with all that money you saved. nancy dawson is passive progressive. you know, nancy, that's actually really inappr-- oh! nancy doesn't have progressive so she takes it out on those who do. you should get luca private coaching with that. maybe he'll score a goal. i figured you'd want the whole roll since you saved hundreds with progressive. how many tickets? two, please. don't be passive progressive. two for becky. drivers who switch could save hundreds. hi. i use febreze fade defy plug. and i use this. febreze has a microchip to control scent release so it smells first-day fresh for 50 days. 50 days!? and its refill reminder light means i'll never miss a day of freshness. ♪ gold bond believes touch says everything.

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get the 5-year price lock guarantee, now back for a limited time. powering five years of savings. powering possibilities™. month. call 1-888-246-2612 or visit homeserve.com. >> i'm richard lui with a news update. the supreme court friday ruling to uphold the federal law that effectively bans the video sharing app tiktok in the us sunday. following the ruling, tiktok confirmed its plans to go dark unless the biden

administration provides a definitive statement assuring non-enforcement of that ban. and new york city mayor eric adams meeting with donald trump friday at his mar-a-lago home. this amid speculation that the president elect could pardon him on his federal corruption charges. adams released a statement following the meeting denying that they discussed his denying that they discussed his legal case. for now, denying that they discussed his legal case. for now, andrea canning (voiceover): it was up to a jury to decide if katie conley was mary's killer. in the courthouse, mary's divided family waited, her husband and children on one side, three of her sisters on the other, still in katie's corner. janine and i both have daughters in their 20s. we were totally terrified for her. andrea canning (voiceover): but defense attorney chris pelli was confident katie would be acquitted. i actually thought that after i gave my closing, that we'd have a verdict in 15 or 20 minutes of not guilty. what was it like waiting for the verdict?

oh, well, the first 20 minutes were ok, but then it went on for day one and day two. andrea canning (voiceover): two days became three. what were they talking about in there? the detective hoped the jury would see past the pretty, put-together young woman in court. was katie really what she seemed? katie, i believe, has another side to her, other than this side that everybody sees from her that she presents to everybody. if this is true, this is a diabolical side. yes, an evil side. andrea canning (voiceover): mary's daughters agree. there was another side of katie that we had not known was there. andrea canning (voiceover): the jury deliberated all through day four. and on day five, they passed a note to the judge. this will be a hung jury. andrea canning (voiceover): there was no verdict. the crowd went silent. afterwards, katie's attorney spoke to some jurors. they told him eight of them wanted to acquit katie

and that the weakest part of the state's case was bill. did you feel that they were believing that he was lying? they told me, under no uncertain circumstances that he was full of it. andrea canning (voiceover): but bill, of course, was never charged with any crime. he told "dateline" he did not poison mary and had nothing to do with her death. and no matter what katie's defense thinks, he can never be charged. as a witness at katie's grand jury hearing, he was given automatic immunity from prosecution. no matter what happens, is he protected for life? for life. forever. forever andrea canning (voiceover): mary's daughters were thankful for that. the accusations against their father had made the trial even more painful. it was just one malicious attack after another. my dad had never attacked anyone in his life. he was just a broken 70-year-old man that was barely functioning. andrea canning (voiceover): now they prepare

to sit through it all again. there was no hesitation. we were going back. we were retrying the case. we needed to get justice for this family and for this woman. andrea canning (voiceover): five months later, everyone filed back into the oneida county courthouse for trial number two. all rise. andrea canning (voiceover): the prosecutor's case was virtually the same. she said everything investigators unearthed pointed to katie as mary's killer. the evidence will show that all roads lead to caitlin conley. andrea canning (voiceover): but katie had a new defense attorney and a new twist to her strategy. he said, yes, katie was innocent and yes, katie was framed. but this time her lawyer was pointing the finger not at bill, but at someone else. ladies and gentlemen, it was adam. it was adam. andrea canning (voiceover): adam, mary's son. defense attorney frank policelli argued that the crime happened just the way katie

described in that letter. frank policelli: he put the colchicine in her supplements when he was over there, either mother's day or father's day, when he had a falling out. andrea canning (voiceover): as for how katie's digital fingerprints ended up on everything related to the colchicine transaction, katie's attorney suggested that could easily have been adam. how do you know, first of all, that she was the one that was researching the poison. since adam had total control of all of her electronic equipment any time he wanted it. andrea canning (voiceover): a key witness this time was adam's cousin and former roommate, david king. in the years since mary's death, david had come to doubt adam and defend katie. andrea canning: do you believe katie had anything to do with the murder of mary yoder? no. not at all. andrea canning (voiceover): on the stand, david told the jury adam was no novice with computers. you're familiar with adam's expertise in computers?

i, uh-- i helped him build a computer in the past. he was going to school for computer science. andrea canning (voiceover): the defense said adam could have hacked katie's devices, or maybe he didn't need to. david testified he saw adam with katie's laptop. and how do you know he had her laptop? i had asked him about it since it was in a flowery laptop sleeve, and it had a picture of a victorian background. that just didn't suit adam's character. so i asked him about it. he said it was katie's, andrea canning (voiceover): and the defense said adam had access to katie's work computer, too. david testified that years earlier, he and adam used to drop by the office when no one else was there. i had helped adam clean the office a number of times. don't think that adam didn't have full reign of that office, ladies and gentlemen. he came and went as he pleased any time he wanted to, ok? andrea canning (voiceover): and the defense said there was something else, something important. remember in her interview with detectives how fearful katie said she was of adam--

andrea canning (voiceover): --katie's attorney said there was a good reason for katie to be afraid. he said adam had abused katie, both physically and sexually. he beat her. he hit her. he raped her. he used her. why wouldn't she be scared of him? andrea canning (voiceover): a year before mary's death, katie filed a police report accusing adam of rape. the defense read a text message katie wrote to adam. katie's words describing the attack-- "you grabbed my right wrist and said you'd snap my wrist and break every one of my fingers. i'm going to kill you. i'm going to kill you, katie. the way you said it, the way you looked at me, and then i was afraid. andrea canning (voiceover): adam denied the allegation, and katie dropped the complaint, but the defense hoped the jury would see katie as a victim, not as a killer. there's no motive in this case. she loved mary yoder. and there's nothing in this case to indicate that her actions were anything

other than loving mary yoder. the people call adam yoder to the stand. andrea canning (voiceover): adam yoder had given his side of the story to investigators early on. was it would he say now? coming up. pain kept getting worse. couldn't even get out of bed. andrea canning (voiceover): a son on the stand with a devastating claim-- had katie used poison on him? do you believe that katie gave him something that made him sick? absolutely. andrea canning (voiceover): who would the jury believe? and would there be a verdict this time? we almost got to the point where we were like, is this all ever going to be worth it? andrea canning (voiceover): when "dateline" continues. how are folks 60 and older having fun these days? family cookouts! ♪♪ playing games! ♪♪ dancing in the par... (high pitched sound)

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beginning at six on msnbc. >> this show began and continues being the place to have the hard being the place to have the hard conversations. andrea canning (voiceover): at the first trial, the defense said katie had been framed by mary's husband bill. but at trial number two, the alternate suspect right from the start was mary's son. ladies and gentlemen, it was adam. it was adam. they changed directions. mm-hmm. father to son. mm-hmm. how hard was that on your brother now being accused not by the state, not by the prosecution, but by the defense, as being your mother's killer? it's horrible. it's just pain added on top of pain on top of pain. i would have never thought at the very beginning that it could be possible for other people to treat a family this way. they don't know the story.

they don't know what's behind the scenes. they just don't know but yet have felt every right to be able to completely try to destroy people's lives. did it feel like your brother was on trial? oh, yes, absolutely. and it just was one allegation after another. andrea canning (voiceover): now, in court, adam took the stand to respond to the defense firsthand. good morning. good morning. andrea canning (voiceover): adam told the jury he never ordered the colchicine, and he did not plant evidence on katie's computers or phone. a prosecution computer expert said katie's devices had never been hacked, and adam told the jury he was hardly the hacker katie's side portrayed. do you have hacking skills? are you able to break into systems? no, i do not, and no, i am not. andrea canning (voiceover): to the defense's claim that adam physically abused katie, he did admit to one incident. i snapped, and i slapped her a few times.

i regretted it immediately. i left the house. andrea canning (voiceover): but as for the alleged rape, no charges were ever filed against adam. and he told the jury he had zero memory of the night it supposedly happened. he'd been drinking heavily. so was this essentially a blackout period? yes, it was. andrea canning (voiceover): he said the next morning, things seemed fine between them. it wasn't until about three months later that katie accused him in that graphic text message. i was in shock. i didn't know how to react. i was panicking. ultimately, i had drank enough to black out that night so i couldn't defend myself. i didn't have a version of the story to say to her in response. andrea canning (voiceover): but adam did have a story about katie, an accusation of his own, and it was a stunner. adam suggested katie might have poisoned him, too. a couple of months before his mother's death, he said katie handed him a bottle of supplements to help

him get through final exams. she told me it's to help basically focus, boost memory. she said, make sure i take it consecutively and consistently because it works better over time. andrea canning (voiceover): after taking the pills, adam said he became so sick, he had to go to the er. with the vomiting and the pain, i started experiencing severe abdomen pain and eventually severe back pain as well. andrea canning (voiceover): that's just how mary's illness began. andrea canning: do you believe that katie gave him something that made him sick? absolutely. andrea canning (voiceover): katie's defense said she had nothing to do with adam's illness. in fact, the state's own lab experts tested the remaining supplements in the bottle and found no poison. but the prosecution's suggestion was clear. maybe katie tried out the colchicine on adam first. i asked her if she had poisoned me in a joking way. and what did she say? said, no, she would never hurt me.

andrea canning (voiceover): like his father, adam had full immunity from prosecution, and he was also cleared by investigators. he maintained his innocence in court. did you ever cause colchicine, in any way, accidentally or intentionally, to be ingested by your mother? no. andrea canning (voiceover): and there was one last discovery that pointed away from adam. right before the second trial, the state's computer experts got their hands on a digital backup of katie's phone. in the files, they found evidence of more incriminating searches. they were screenshots of different poison searches that kaitlyn conley was doing before she actually honed in on colchicine. she looked at arsenic. she looked at thallium. she looked at cyanide, she looked at poison mushrooms. and one of the other screenshots that we found was of the 10 most toxic substances in the world,

but we didn't have any of those screenshots in the first trial. none of them. i submit to you, ladies and gentlemen, that the evidence is clear and that the common denominator is this defendant, kaitlyn conley. andrea canning (voiceover): once again, katie's fate was in the hands of a jury, 12 men and women who would either send her to prison for much of her life or home to her family a free woman. it's inconceivable. no one can ever say that this is what she did. this is not her. she's the same nice, nurturing, helping person that she was and always has been. andrea canning (voiceover): the charge was second-degree murder. but after all that testimony and over the objections of the defense, the judge allowed the jury to consider a lesser charge of manslaughter. to convict, the jury would only have to find that katie intended to hurt mary, not kill her.

a day passed without word. on day two, the judge received a note. the note reads "hung jury." andrea canning (voiceover): it was looking like another mistrial. the thought was exasperating for mary's children. we almost got to the point where we were like, we were-- is this all ever going to be worth it? andrea canning (voiceover): the judge encouraged the jury to keep trying. i urge that each of you make every possible effort. andrea canning (voiceover): and just two hours later-- man: the record will reflect that the jury has re-entered the courtroom, indicating that they have reached a verdict. andrea canning (voiceover): first, the most serious charge. woman: murder in the second-degree, how do you find the defendant, guilty or not guilty? juror: not guilty. andrea canning (voiceover): not guilty of second-degree murder. as for manslaughter-- woman: guilty or not guilty? juror: guilty. [woman gasping] andrea canning (voiceover): as katie absorbed the news, her mom had to be escorted out in tears.

katie tried to reassure her family, but her sisters were distraught-- katie, we love you. we love you. andrea canning (voiceover): --as were mary's sisters. without them, an investigation may never have happened. now, someone they thought was innocent was headed to prison. the judge sentenced katie to 23 years behind bars. you're going to keep fighting for katie? oh, definitely. we have to. was justice done with the guilty verdict? there's an accountability. yes, she did not get away with it. andrea canning (voiceover): mary's daughters are relieved the trial is over, but they mourn the family they once had. so many lives shattered. andrea canning: this destroyed an entire family. not just a death. not just our family. it destroyed her family. it destroyed so much. we're hoping to finally be able to go back to the good memories and not have to relive the worst one. we want to be able to actually celebrate her life.

andrea canning (voiceover): mary's loved ones may be divided over who killed her, but there's one thing they can agree on-- it's not how mary died that should be remembered, it's how she lived. she could light up any room, any situation. i mean, she was there for you, no matter what, no matter when you called, no matter what you needed your mom for. the world is not as wonderful a place as it was. mary was-- mary loved life more than anyone else i ever knew. janine bakert king: and she made a point of loving it. she really did. [theme music] my moderate to severe crohn's disease... ...and my ulcerative colitis symptoms... ...kept me... ...out of the picture. now... ...there's skyrizi. ♪i've got places to go...♪ ♪...and i'm feeling free♪ ♪control of my symptoms means everything...♪ ♪...to me♪

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