. he used to be a competitive gamer but with the higher lag, he can't keep up with his squad. so now we're his “squad”. what are kevin's plans for the fall? he's going to college. out of state, yeah. -yeah in the fall. change of plans, i've decided to stay local. oh excellent! oh that's great! why would i ever leave this? -aw! we will do anything to get him gaming again. you and kevin need to fix this internet situation. heard my name! i swear to god, kevin! -we told you to wait in the car. everyone in my old squad has xfinity. less lag, better gaming! i'm gonna need to charge you for three people. and a programming note for next weekend. be sure to catch my cable tv exclusive and wide ranging interview with former president bill clinton next saturday and sunday at 6:00 p.m., right here on msnbc. yelled, and she cr ied. it's terrible.ied. did she fall down the steps?

no one was thinking someone did this to her, but did someone do this to her? it just unraveled from that moment on. bobby scaccio: the fashionista with red lipstick. she meant the world to me. when she walked into a room, it was like a movie star walked in. josh mankiewicz (voiceover): corporate executive, caring mom, a million dollar smile, and a $4 million estate. josh mankiewicz (voiceover): murder. i went screaming out of the house. this was a prominent woman murdered in her home late at night. almost certainly someone she knew. correct. josh mankiewicz (voiceover): where would it lead? a twisted case of betrayal and greed. the finger is being pointed at me. josh mankiewicz (voiceover): her own daughter a suspect from the start. you pull the knife out, and you tell the police, oh, you're gonna find my fingerprints on the knife. josh mankiewicz (voiceover): her son-in-law, who seemed so devoted. they interrogated us for eight hours.

josh mankiewicz (voiceover): or maybe someone else with a million dollar motive. what's going on here? how many people are involved in this? devious. devious is an evil mind. someone just doesn't turn into a murderer. hello, and welcome to "dateline." she was a smart, loving, wealthy widow in the suburbs of new york city and an unlikely target for such a brutal murder. police immediately zeroed in on the most likely suspect. but solving this crime would not be easy or quick. here's josh mankiewicz with "the evil to come." josh mankiewicz (voiceover): it was hard to look away when peggy was in the picture. her beauty was captivating. but she was also smart, ambitious. and she loved that little girl.

peggy nadell's image survives in home movies and in memory, from the days when she was relishing motherhood, blissfully unaware of the evil to come. i was always close with my mother. always. josh mankiewicz (voiceover): susanne nadell-scaccio was that little girl and says her mom, peggy, was everything a mother should be. as a child, i ice skated. my mother would sit in the rink and freezer. she'd sit there with a coat on, all bundled up, shivering. josh mankiewicz (voiceover): susanne and her younger brother, jim, grew up in suburban rockland county, about 45 minutes north of new york city. susanne nadell-scaccio: we were able to go away to sleepaway camp when we were little. my parents traveled. josh mankiewicz (voiceover): at first, peggy did what many women did in the 1960s. she stayed at home, while her husband, rob, headed off to work. but peggy was drawn to something bigger than her suburban sanctuary.

when susanne was young, her mom was back in school, earning her mba. she was probably one of the few women in the graduating class. and then went into a man's business. and then went into a man's business and worked very hard. josh mankiewicz (voiceover): much like the fictional character peggy olson in the hit series "mad men," the real life peggy broke the glass ceiling at xerox and became a rare member of the executive boys' club. anne martin was in that club, too. we didn't have too many female managers. and peggy. she rose very quickly because she was very intelligent. josh mankiewicz (voiceover): and always well-dressed. peggy wore a lot of black. she loved to dress and wear the latest fashions. josh mankiewicz (voiceover): unlike her fashionable mom, susanne was a blue jeans and t-shirt kind of girl. susanne-- how do you explain susanne? she's quirky. she's outgoing.

she's athletic. josh mankiewicz (voiceover): darcy greenberg is one of susanne's best friends. she's spontaneous. she's talkative. she also likes to be close to home. josh mankiewicz (voiceover): after college, she came back to rockland county and went to work at xerox herself. one night in a bar, susanne, then 21, fell for-- well, actually fell over-- a 17-year-old race car driver named bobby scaccio. bobby scaccio: she actually stepped on me. i was-- we were fooling around, and i somehow wound up slipping on the floor. she picked me up, and we saw each other and started talking. josh mankiewicz (voiceover): 13 years later, susanne and bobby, who was by then a welder and steamfitter, were married. bobby made a good son-in-law. he was always there for peggy, especially after her husband died in 2003. by then, peggy was retired, but never

slowed down, traveling the world and treasuring her family. her son, jim, was now a psychologist living in florida with his wife, diana, and their two children. i get the sense that jim was not as close to your parents as you were. i'll agree to that. [chuckles] and why would that be? maybe because of the distance, that he was so far away. he did call. he did speak to them. but my brother is my brother. he kind of lived in his own world. josh mankiewicz (voiceover): but susanne and her mom were very much in the same world. how often did you see your mother? almost every day. josh mankiewicz (voiceover): susanne, always on the road for her work as marketer for a hospital, would often drop in on her mom. and when she wasn't visiting, she'd be calling. speak to her in the afternoon, in the evening. make sure she was home. so it's almost like you were sort of the parent and she was the kid. you were checking up on her. susanne nadell-scaccio: oh, absolutely. josh mankiewicz (voiceover): life was good for this family

until one morning in january of 2014. susanne went to check on her mother. susanne nadell scaccio (on recording): oh, my god. oh, my god. oh, my god. oh, my-- i need an ambulance right away. josh mankiewicz (voiceover): and everything changed. craig melvin (voiceover): coming up. i was screaming. susanne is in the driveway, looking rather frazzled. susanne nadell-scaccio: the first thought was, oh, my god, she tripped and she must have hit her head. no way did she fall down the stairs. craig melvin (voiceover): when "dateline" continues. ♪♪ stay ahead of your child's moderate-to-severe eczema. and they can show off clearer skin and less itch with dupixent, the #1 prescribed biologic by dermatologists and allergists, that helps heal your child's skin from within. serious allergic reactions can occur that can be severe. tell your doctor about new or worsening eye problems such as eye pain or vision changes including blurred vision, joint aches and pain, or a parasitic infection. don't change or stop asthma medicines without talking to your doctor.

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josh mankiewicz (voiceover): saturday, january 25, 2014, started off cold and snowing. susanne says her day started off as it nearly always did-- calling her mother, peggy. susanne nadell-scaccio: called the cell. she didn't answer. i called the house. she didn't answer. i said, all right, maybe she's in the bathroom, or she went out into the garage for something. josh mankiewicz (voiceover): susanne, who was living in a suburb of new york city, called diana, her sister-in-law in florida. susanne nadell-scaccio: and i said, have you spoken with mommy this morning? she says, you know, i called her at 7:30, and i haven't heard back from her. josh mankiewicz (voiceover): now worried, susanne got in her car and drove to peggy's house. susanne nadell-scaccio: as i'm driving, i'm calling the house, the cell, the house, the cell. no answer. and now i'm getting panicky. i pull into her driveway and i saw the roof of her car through the garage door. and i said, oh, this is not going to be good.

josh mankiewicz (voiceover): she was right. susanne says she found peggy crumpled at the bottom of the stairs with a knife in her chest. susanne nadell-scaccio: and the first thought was, oh, my god, she tripped on the cat and fell and stuck herself. josh mankiewicz (voiceover): then, she says, she saw the blood. and i said, oh, my god, she must have hit her head when she fell. josh mankiewicz (voiceover): and then susanne did something that would later raise a number of questions. susanne nadell-scaccio: i pulled the knife. i was going to do cpr. you pulled the knife out of her? yeah. if your mother was laying there with something sticking out of her that was hurting her, what would you do? you'd want to make that hurt go away. could you tell whether she was dead or alive? when i touched her neck, and she was kind of cold. josh mankiewicz (voiceover): susanne ran out of the house and called 911. i was screaming. i'm sure the neighbors that were around heard.

josh mankiewicz (voiceover): susanne was right about one thing-- peggy nadell was dead. her next call was to her brother, jim, in florida. susanne nadell-scaccio: i called my brother's house. he didn't answer. i called diana on her cell. and i said, mommy's gone. and she started screaming at the other end of the phone, what do you mean mommy's gone? i said, she's gone. she died. something happened. she died. josh mankiewicz (voiceover): soon, clarkstown police detectives stephen cole-hatchard and earl lorence were on the scene. they noticed that susanne looked a wreck, standing in front of the house in the snow. earl lorence: susanne is in the driveway at the foot of the driveway, kind of pacing, looking rather frazzled. josh mankiewicz (voiceover): she told detectives what she told the 911 operators-- that peggy tripped over the cat. her mother must have tumbled down the stairs and stabbed herself with the knife. josh mankiewicz (voiceover): while detective cole-hatchard

stayed outside with susanne, detective lorence went inside the house. this is police video of the scene taken that morning. lorence knew right away this was no accident. no way did she fall down the stairs and trip over a cat. josh mankiewicz (voiceover): detective lorence saw peggy had been strangled, then stabbed. and it also looked as if she'd been beaten with a statue head found under her body and a gold medal ball near her hand. earl lorence: the crime scene itself was very concentrated. everything was at the bottom of the stairs and in the bedroom upstairs. josh mankiewicz (voiceover): something else caught the detectives' attention-- two chairs were pulled out at the kitchen table as if peggy had been sitting and talking with someone. peggy's computer, wallet, and jewelry were missing. a jewelry box lay near a chair in the living room-- empty. but to earl lorence, the burglary looked phony, staged.

the bedroom drawers, they were neatly pulled out and neatly placed on the floor in front of the dresser. at normal burglary scenes, stuff is everywhere. people go through it like a tornado. correct. josh mankiewicz (voiceover): and this wasn't a break-and-enter job. police could tell that when they looked at the fresh snow outside the house. earl lorence: there was one set of footprints, and that was the responding officer checking the perimeter of the home. so nothing suggesting that somebody had walked around, cased the place-- not a thing. josh mankiewicz: --to see who was in. josh mankiewicz (voiceover): the front door hadn't been jimmied or broken in. which the key in the deadbolt in the front door that's required to open the door from the inside, and that was in the lock. meaning peggy had unlocked it from inside. correct. josh mankiewicz (voiceover): that afternoon, detectives brought susanne and her husband, bobby, to the police station and started asking questions. josh mankiewicz (voiceover): susanne told them contractors had been doing work on peggy's bathroom and that peggy also had landscapers and a cleaning

woman working for her. i'm guessing you guys spent some significant time and effort running down all the people who had worked on the house. absolutely. any of that go anywhere? dozens of people, not a thing. josh mankiewicz (voiceover): who would want to kill peggy nadell, and why? assistant district attorney richard moran thought he had an answer for that second question. financially, she was in pretty good shape. very good shape. josh mankiewicz (voiceover): peggy and her late husband had built quite a large nest egg. all in all, the estate ended up being worth about $4 million. well, you've probably seen people kill for a lot less. a lot less. josh mankiewicz (voiceover): and who would stand to benefit? craig melvin (voiceover): coming up. i felt very early on that it was most likely a female. craig melvin (voiceover): a closer look at susanne. you pull the knife out. and you tell the police right away, oh, you're going to find my fingerprints on the knife. craig melvin (voiceover): a few million motives for murder?

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experience how great splenda stevia can be. grown on our farm, enjoyed at your table. (♪♪) enjoyed at your table. josh mankiewicz (voiceover): peggy nadell had been murdered in her home in suburban rockland county, new york. detective stephen cole-hatchard and earl lorence say the team from the crime lab had shaken peggy's house to its foundation,

looking for a lead. forensically, you guys got almost nothing off the scene. not almost nothing. nothing. no fingerprints? no fingerprints. josh mankiewicz: no dna? no dna. no blood, no hair. nothing. josh mankiewicz (voiceover): but the scene did tell them something. i felt very early on that it was most likely a female or two females. what pointed to it being women? the fact that there was seven or eight lacerations on peggy's skull from the statue head. josh mankiewicz (voiceover): that statue is heavy, an effective weapon in strong hands. earl lorence: my non-medical opinion is that if she was hit in the head with that statuette by a man, her head would have caved in. a man would have been able to swing the statuette harder. one or two times at the most. josh mankiewicz (voiceover): and all of that pointed straight to peggy's daughter, susanne. not only did susanne stand to inherit half of her mother's

$4 million estate, detectives thought her behavior was suspicious from the moment they arrived on the scene. she's saying, my fingerprints are all over the knife. my dna is all over inside the house. josh mankiewicz (voiceover): and she was telling detectives the same thing she said during the 911 call-- that it was an accident in the 911 call, you are offering a theory of what happened. that's very unusual. well, i thought she fell. secondly, you pull the knife out. and you tell the police right away, oh, you're going to find my fingerprints on the knife, which sounds like somebody who's thinking ahead to the fact that that knife is going to get dusted for fingerprints. sure. sure. would you not agree that all of that is pretty suspicious, when taken together? maybe to them. it wasn't to me. [chuckles] i mean, obviously, they formed an opinion from the get-go.

josh mankiewicz (voiceover): detectives thought this was odd as well. she said, listen, maybe this was a burglary. check for a large ring, a laptop, and jewelry. and i called into earl. i said, earl, check for those three things. he called me back and said, hey, it's pretty much those are the only three things missing. josh mankiewicz (voiceover): then, again, in those first few moments, susanne started talking about peggy's money. stephen hatchard-cole: one of the things she yelled out was, my mother's worth high seven figures. josh mankiewicz (voiceover): and-- this is not the way i wanted to get my money. money. that's the exact word she used. this woman wants to talk her way right into sing sing. yeah. absolutely. josh mankiewicz: at one point you said, this is not how i wanted to get my money? i don't recall saying that. but if they have that on-- you know, on record. but you believe me that that's what you told police? yeah. because, again, you're answering a question that police haven't even asked yet. mm-hmm.

i guess i watched too many of those "dateline" shows in the middle of the night. josh mankiewicz (voiceover): detectives had already talked with susanne and her husband, bobby, on the day of the murder, questioned them for hours. but you had nothing to worry about. no. no, not at all. not at all. farthest thing from my mind is that i would be a suspect or my wife would be a suspect. josh mankiewicz (voiceover): police were feeling differently. and as their scrutiny intensified, bobby and susanne decided to hire an attorney and stop talking to police. assistant district attorney richard moran said that slowed everything down. the best way to get information about the investigation would be through her. and once she stops talking to us, things take a lot longer. josh mankiewicz: there was a point at which you and your wife stopped cooperating with police and hired an attorney. no, we didn't stop cooperating with the police. that's what they want you to believe. anything they wanted to know, all's they had to do

was ask my attorney. your wife feel the same way about that? oh, absolutely. absolutely. she was just scared that they were going to try and pin it on her. josh mankiewicz (voiceover): once again, susanne was right. we had, we believed, probable cause to arrest susanne. we just couldn't do it because something was wrong. what's wrong? i mean, everything points at her. it would have been the easy way out to do that too early. sometimes you get a ground ball. this wasn't a ground ball. josh mankiewicz (voiceover): this would be no easy out. detectives would be going into extra innings. craig melvin (voiceover): coming up, the two final phone calls of peggy nadell's life. one came on a secret phone. these are the phones used by drug dealers, killers, cheating spouses. - exactly. - that's correct. craig melvin (voiceover): could that caller be the killer? when "dateline" continues.

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hi, i'm richard lui with the news update. the white house will allow ukraine to use u.s. made long- range weapons for limited strikes inside russia. president biden is alarmed by north korea sending its own soldiers to help russia. and grimmway farms has issued a recall for select organic whole and baby carrots due to e. coli contamination. the cdc reporting 39 cases across 18 states including one death. these carrots are sold at major chains like whole foods and trader joe's. for now, back to dateline. gathered for her funeral. for peggy's daughter, susanne, it was all a blur. what's it like to process both the fact that your mom was actually murdered, and that you're the suspect? it was horrible.

horrible. i lost my mother. i lost my best friend. and now the finger is being pointed at me. as 80-year-old peggy nadell was laid to rest today, her daughter, susanne scaccio, has hired a lawyer. people in the area, it's all they talked about. josh mankiewicz (voiceover): susanne's friend, darcy greenberg, was hearing it almost every day. darcy greenberg: there were people who said, she did it. oh, she did it. even i heard a neighbor yelled out, when are you going to arrest her for killing her mother? i mean, this is someone that probably knew her since she was a child. josh mankiewicz (voiceover): darcy was convinced susanne loved her mother and would never have hurt her. she was grieving. she was crying every day. she could barely get out of bed. she couldn't sleep at night. josh mankiewicz (voiceover): peggy nadell's murder was now the biggest case ever to hit the clarkstown police department. we had the whole detective bureau on this and some other agencies. and i've never seen them work harder on anything in my life.

josh mankiewicz (voiceover): perhaps because police couldn't talk with susanne, they stayed very close to her and her husband, bobby, and very visible. susanne nadell-scaccio: they parked outside my house and sat. when i left, they left. when i came home, they came home. they were following my husband. did you think police were going to come put handcuffs on you? yes, i did. i was sad, and i was scared. josh mankiewicz (voiceover): police even looked into susanne's shopping habits and found something that intrigued them. susanne bought her groceries at a nearby shoprite, a big supermarket chain. in fact, she was a creature of habit, visiting there 22 times in the month prior to peggy's murder. but on the 23rd time, the night before peggy's murder, susanne shopped at a different store, the one near her mother's house. josh mankiewicz: what'd she buy? stephen hatchard-cole: she bought cleaning supplies, rubber gloves, and some other items

like that. - some food item. josh mankiewicz (voiceover): had the crime scene been cleaned up? detectives didn't think so, but still found it suspicious. josh mankiewicz: just before your mother was murdered, you go to the shoprite-- not the one near your house, the one near your mother's house-- and you buy rubber gloves and cleaning supplies. i did. i mean, i buy cleaning supplies all the time. i have a cleaning girl. she probably needed rubber gloves. she probably needed floor cleaner or-- that's interesting. they knew what i bought. josh mankiewicz (voiceover): and detectives wanted to know more about who peggy might have had contact with in the hours before her murder. so they made this list of numbers they found on peggy's home phone. and as they looked at them, one stood out. it was a call from an odd area code, and it came in at 1:17 in the morning. that was from what turned out to be a track phone. they're commonly referred to as burner phones or throwaway phones. these are the phones used by drug dealers,

killers, cheating spouses. exactly. that's correct. josh mankiewicz (voiceover): a few minutes after that track phone call, the alarm at peggy's front door was tripped. and at 1:23 am, the alarm company called. josh mankiewicz (voiceover): it was probably the last time peggy's voice was heard by anyone, except her killer. police were convinced-- still are convinced-- peggy was letting in someone she knew. susanne? maybe. but why would she use a track phone to get her mom to open the door in the middle of the night? she wouldn't have to let me in. i have a key, and i know how to work the alarm. right. so if you wanted to kill her, you could have just waited-- - i could have-- - --until she went to sleep-- and went in.

josh mankiewicz: --unlocked the door-- and went in. josh mankiewicz: --and disarmed the alarm. there you go. there you go. josh mankiewicz (voiceover): police had warrants for all the family members' phones. and a few weeks later, they had boxes of records to comb through. detectives analyzed susanne's first. what could you tell about susanne from her cell phone records? a lot. [laughs] josh mankiewicz (voiceover): robyn arias was an investigator in the westchester county da's office specializing in phone data analysis. i figured out a pattern of susanne's life, just based on her records. josh mankiewicz (voiceover): and on the day of peggy's murder-- that day was like every other day in susanne's life. there was no change for that particular day. and you'd expect to see a change if somebody was in the process of committing murder for the first time. correct. correct. suggesting she's innocent? either she's innocent or she has another phone. but there certainly wasn't communication that indicated that something was going to happen.

josh mankiewicz (voiceover): as hot as detectives were on susanne's trail, they had never stopped looking at the other members of peggy's immediate family. josh mankiewicz: you talked to peggy's son, jim, and his wife, diana, right after the murder. yes, when they came up. they lived in florida. correct. were they in florida at the time of the murder? jim was in florida, and diana said she was in dc. why was she in dc? she said there was a family wedding. josh mankiewicz (voiceover): and the records back that up. when robyn arias looked at jim's cell phone, it never left florida. diana's phone records checked out, too. where was diana's phone during that time? in dc. that's it? didn't move? yep, did not move. the phone went to dc, went back to florida. reasonable to assume that diana never left dc? absolutely. you're smiling. [chuckles] it was just a break that the pattern just was off. josh mankiewicz (voiceover): diana's records were speaking to arias, and detectives were about to get

a break that would shift the direction of the entire investigation. let's just say this case was about to go south. that secret burner phone-- who bought it? who used it? get ready for a whole new circle of suspects. craig melvin (voiceover): coming up. so what's going on here? how many people are involved in this? that's the question of the day. craig melvin (voiceover): when "dateline" continues. if you're living with moderate to severe plaque psoriasis or active psoriatic arthritis, symptoms can sometimes hold you back. but now there's skyrizi, so you can be all in with clearer skin. ♪ things are getting clearer ♪ ♪ yeah, i feel free ♪ ♪ to bare my skin yeah, that's all me. ♪ ♪ nothing is everything ♪ with skyrizi, you can show up with 90% clearer skin. and if you have psoriatic arthritis, skyrizi can help you move with less joint pain,

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josh mankiewicz (voiceover): detectives working on peggy nadell's murder had been looking at her daughter, susanne, but now they were also looking at peggy's daughter-in-law, diana. diana and peggy's son, jim, had been married for 17 years, and while he may not have been that close to his mother, diana was always on the phone. my sister-in-law used to call every morning. she-- my mother would be on the phone with me and say, oh, i gotta go. diana's calling on the other line. josh mankiewicz (voiceover): diana was a stay-at-home mom with two kids, leah and harris. peggy doted on her grandchildren and would fly them up to new york to spend summers and holidays. detectives had already confirmed that diana's cell phone had been in washington, dc, at the time of the murder. but when phone analyst robyn arias looked more closely at diana's calling pattern,

something seemed off. when she was in dc, her activity was just all over the place, kind of the frenetic feel. there was definitely something going on. josh mankiewicz (voiceover): now arias looked at who diana was calling, putting names and faces to the numbers on her phone. she noticed diana suddenly seemed to have a lot of new friends in washington, dc. a lot of people just popped up in diana's life for a very brief moment. josh mankiewicz (voiceover): arias calls them frequent users, people diana was calling repeatedly. robyn arias: what was also interesting to me about these frequent users is that they just had such different lives. josh mankiewicz (voiceover): diana was a suburban mom, and some of these people, well-- a lot of them had criminal histories, living in dc. josh mankiewicz (voiceover): remember, diana had been in dc for a wedding. maybe these people were, you know,

those friends of the groom you have to invite. so detectives got the guest list. and none of the high frequency callers were at the wedding. none of those people. josh mankiewicz (voiceover): and when arias looked at diana's phone records on the night of the murder, friday night into saturday morning-- the time of the homicide, there was very little activity on her phone, like eerily quiet. josh mankiewicz (voiceover): what did that mean? diana's phone had been in dc. that looked like a dead end. so detectives went back to that track phone that had called peggy's house moments before her murder, the kind of phone you can buy for cash, activate from almost anywhere, and then dump when you're done. a lot of times, that's a dead end. a lot of times. not this time. not this time. josh mankiewicz (voiceover): to figure it out, detectives began by using the track phone number to find where the phone had been sold. and where was it purchased? the family dollar store in miami, florida.

miami? about two miles from diana's home. josh mankiewicz (voiceover): detectives contacted the family dollar chain and got very, very lucky. family dollar was able to give them security video of someone buying a track phone on january 23, just two days before peggy was murdered. josh mankiewicz: is diana on the tape? it doesn't appear so. so end of the road? no. josh mankiewicz (voiceover): no, because the woman buying the phone was someone detectives recognized. josh mankiewicz: not diana? definitely not diana. who is it? karen hamm-samuels. josh mankiewicz (voiceover): and how did they know who she was? karen hamm was somebody i had already profiled as a person who came up frequently on diana's call records. she was a high frequency caller. so you've got a friend of diana's buying the disposable phone that called peggy just before she was killed. yeah.

that was a big moment. josh mankiewicz (voiceover): now they knew who had bought the phone. the next step was to figure out who turned the track phone on. track phones need to be activated using another phone to call an 800 number. after three weeks, detective cole-hatchard finally persuaded a track phone manager to give him this piece of paper. stephen hatchard-cole: he had circled a phone number, and it was the number that called to activate that track phone. whose number was that? andrea benson. had that name surfaced before? yes, absolutely. all over diana's phone records. josh mankiewicz (voiceover): she was one of those people who had popped into diana's life when diana was in dc. and benson had a rap sheet. so what's going on here? how many people are involved in this? that's the question of the day. josh mankiewicz (voiceover): the other big question, what did diana nadell do while she was in washington, dc? detectives started with her arrival at reagan national

airport 9:30 friday morning, the day before peggy was murdered. earl lorence: we got the video from the airport to follow her through the airport and then follow her outside to where she got into a car. josh mankiewicz (voiceover): here's video of diana being picked up curbside. josh mankiewicz: who picks her up? earl lorence: andrea benson. how do you know it's andrea benson? it's her car registered to her. you can read a license plate from those cameras? they're pretty good. josh mankiewicz (voiceover): detectives obtained data dumps from cell phone towers in washington, dc. that allowed them to map the travel of the cell phones as they pinged off the towers. can you follow diana's cell phone? it bounced all around washington, dc, simultaneously with andrea's. they were together the entire day. josh mankiewicz (voiceover): by late friday, the night peggy was murdered, diana's phone stopped moving and went quiet. but andrea's phone? stephen hatchard-cole: we saw andrea's

phone head out of the washington area and head up i-95. exactly the way you would drive if you were heading for peggy's house. right. josh mankiewicz (voiceover): along the way, the track phone was activated. and at 1:17 am, it pinged a cell tower right near peggy's house. what was going on? was this murder-for-hire? did andrea benson drive up to new york, call peggy on the track phone, somehow get into her house, and then murder her assistant da moran didn't think so. peggy would never have let a stranger like andrea benson into her house. so that had to be a friendly voice on the phone. yes. josh mankiewicz (voiceover): detectives thought that voice might have belonged to diana. but they had nothing to put her on the scene in peggy's house. at this point, is susanne off the hook? diana is now the higher suspect. susanne wasn't off the hook.

they could be in this together. - correct. - yes, that's where it was. because they both benefited. absolutely. josh mankiewicz (voiceover): now, eight weeks into the investigation, detectives still didn't know who had killed peggy nadell. with suspects in florida, dc, and new york, detectives came up with a new strategy. and their phone expert liked it a lot. gutsy. like, i mean, a lot of people don't go to those lengths on a homicide case. i thought it was a brilliant strategy. josh mankiewicz (voiceover): but would it solve the case? craig melvin (voiceover): coming up. did you have anything to do with your mother's murder? craig melvin (voiceover): the daughter or the daughter-in-law? craig melvin (voiceover): was one of them the killer? bobby scaccio: oh, god. her eyes were probably about as big as the headlights on a volkswagen beetle. craig melvin (voiceover): when "dateline" continues. dupixent can help people with asthma breathe better in as little as 2 weeks. so this is better.

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and she couldn't believe she was ever a suspect. josh mankiewicz: you watch "dateline." all the time. sometimes, as you know, people look guilty, but they're really not. are you in custody right now? no. were you ever arrested? no. did you have anything to do with your mother's murder? no. josh mankiewicz (voiceover): deep into the investigation of peggy nadell's murder, the prime suspect was no longer her daughter, susanne. it was her daughter-in-law, diana. detectives knew that diana's friend, karen hamm-samuels, had bought the track phone that called peggy's house just before she was murdered. diana had told police from the beginning that she'd been in washington, dc, to attend a wedding. but her alibi was wobbly. diana couldn't account for her time in dc. she hit washington at about 9:30 and didn't reappear again until about 8:00 o'clock the next morning.

josh mankiewicz (voiceover): so detectives called diana, asking her to fill in the gaps. we had to keep it real simple with her. listen, we just want to get you cleared. where did you spend the night? josh mankiewicz (voiceover): what did they not tell diana? detectives had a warrant, and they were tapping her phone. police now sat back and listened as diana made multiple calls to people she knew in dc, as she tried to find someone, anyone, who would say they were with her in washington at the time of peggy's murder. josh mankiewicz: was she ever successful enough to find somebody to say, yes, i will say, diana, that you were with me? yes, she did. yes, which was her third attempt. josh mankiewicz (voiceover): detectives heard diana tell a female friend to say diana had been at her house in dc, but the woman seemed confused.

disorganized crime. not the most intelligent people involved, i don't believe. josh mankiewicz (voiceover): sure enough, when detectives called diana's friend, here's what she said. josh mankiewicz (voiceover): of course, detectives already knew the woman was lying and that diana was trying to cover her tracks. but they still didn't have enough to charge diana. so they headed to miami to speak with diana's friend who bought that track phone, karen hamm-samuels. they brought karen into miami police headquarters for questioning. josh mankiewicz (voiceover): karen admitted she'd bought that track phone for diana. and then they asked her if diana had said anything about peggy nadell's murder. her answer blew them away.

josh mankiewicz (voiceover): prosecutor richard moran was there, listening in another room. that's the first time we have firsthand information that diana was in the house. josh mankiewicz (voiceover): before long, diana was in that same miami interrogation room, where she recognized some familiar faces she probably wasn't pleased to see. josh mankiewicz (voiceover): and she knew why they were there. josh mankiewicz (voiceover): yes, it was. and after five months, their investigation was about to end. josh mankiewicz (voiceover): that same day, another team arrested andrea benson in dc. detectives lorence and cole-hatchard were confident

they had the right people in custody and that susanne was finally off the hook. she heard the news from relatives. they said they arrested diana for my mother's murder and that there were other people involved in it. and i was shocked. what'd she look like? oh, god. her eyes were probably about as big as the headlights on a volkswagen beetle. and her instant reaction was, i knew it. i knew it. josh mankiewicz (voiceover): susanne says her mom had been sending money to diana regularly to pay for home repairs and expenses for the kids. but she says diana wanted more. susanne nadell-scaccio: she wanted to live my mother's life, do all the things that she couldn't afford to do. and to do that, all she had to do was enlist the help of a few friends and commit a murder. mm-hmm. yeah. josh mankiewicz (voiceover): detectives did not think jim knew anything about his wife's deadly plan for his mother. and what exactly was her plan? diana had stopped talking and asked for a lawyer.

but her friend, andrea benson, did talk and told da richard moran the whole sordid tale. andrea said she had never met diana before and had been told by a relative to pick diana up at the airport. and as they were driving-- richard moran: diana nadell said to her, i'm not really here to go to a wedding. i'm really here to kill my mother-in-law. she says this to a person she's never met before. yes. and andrea benson says, ok, i'm in? for $10,000. and right there, the deal is done in that car. and the plan starts taking shape. josh mankiewicz (voiceover): benson said she drove the four hours up to peggy's house. and then diana used that track phone and called her mother-in-law. diana tells her, i'm here. don't you miss me? i want to come see you. at 1:30 in the morning, and peggy lets her in. josh mankiewicz (voiceover): benson said she went in with diana. they were wearing hairnets and gloves to keep

from leaving evidence. diana and peggy sat across from one another and talked. benson said at one point, peggy went upstairs, perhaps to call for help. she and diana followed her. then, as peggy came back downstairs-- that's when andrea benson started choking her. josh mankiewicz (voiceover): andrea said peggy was still alive when diana hit her mother-in-law with a metal ball and beat her with that statue head. andrew benson's words were she wouldn't die. at that point, according to andrea benson, diana nadell went into the kitchen, got a knife, came over, and started stabbing peggy. josh mankiewicz (voiceover): andrea benson pleaded guilty to second degree murder. the sentence was 20 to life. i need you to know just how sorry i am. josh mankiewicz (voiceover): the woman who bought the track phone, karen hamm-samuels, was never charged with anything.

diana, apparently not content to wait in jail for trial, was caught on tape trying to arrange for a hitman to kill karen hamm-samuels in miami. josh mankiewicz (voiceover): after that, diana also pleaded guilty to first degree murder. diana did not respond to our requests for an interview. she did speak on the day she received a sentence of 23 years to life. i would like to say that i'm very sorry for my actions and that i am extremely sorry for any pain i may have caused, especially to my husband. josh mankiewicz (voiceover): susanne was there at sentencing. you took away a wonderful mother and grandmother, and you're going to die in hell. i hope you stay in prison until you take your last breath. enjoy prison.

josh mankiewicz (voiceover): on mother's day, susanne and bobby went to visit peggy's grave. hey, mama. josh mankiewicz (voiceover): finally, it was all over. bobby scaccio: you kind of look at life a little bit differently. you know, life is very valuable. it's precious. it puts things in perspective. you've done anything special for yourself? i treated myself to a car. she's a fancy german lady that likes to go fast. my mother always said, spend a little. enjoy your money. you'll have mine someday. who knew that someday was going to be so soon? and that's all for this edition of "dateline." i'm craig melvin. thank you for watching. [theme music]