around the today show family even if we don't get her every single morning. instead, every morning she will be waking, waking up and walking her daughters to school with a cup of coffee and zipping around the burbs. you see it right there in her new white minivan. i could not be happier for my friend hoda or her beautiful girls hope and haley. and on that beautiful note, i wish you a very, very good night from all of our colleagues across the networks of nbc news. thanks for staying up late. i'll see you at the end up late. i'll see you at the end of monday. matt harvill: sherri was an extremely devoted mother. [faint speech] why would she go missing? this case took on a life of its own. because you knew her? absolutely. you can't sleep. you can't eat. it's just worry. where is she? we had various witnesses that saw her getting into this car.

there were handcuffs involved. the badge involved. something was terribly wrong here. matt harvill: blood is found inside the car. sean conroy: i believe that there was a hellacious fight in that car. karlyne guess: i knew that wherever she was, she was being held against her will or worse. josh mankiewicz: a mother kidnapped and a mind-bending trail of clues. who the heck is this woman, and what does she have to do with sherri? it's like something out of a movie. it's like something out of a bad movie. [music playing] josh mankiewicz: it all happened so quickly. in the parking of a target on a bright monday morning, a woman was handcuffed, bundled into a car, driven away.

it left behind a mystery that would expose a troubled marriage, some devious manipulations, and the darkest corners of people's lives. you think to yourself, how could i have been that wrong about someone? absolutely. you know, it was the perfect storm. [music playing] josh mankiewicz: this little street of modest homes in ventura, california was just the perfect place, nothing fancy, but close enough to the ocean to feel the salt air. young families grew up together here. can you hit the doggy? josh mankiewicz: and in this neighborhood, there were only friends, at least until it all changed. get it. get it. josh mankiewicz: may 6, 1996, nurse kristin best received a phone call at work. it was the husband of her friend, sherri dally, who also took care of kristin's girls after school. i got a call from mike that sherri had just not shown up to pick up the kids at school.

and that wasn't like her? no. josh mankiewicz: so that day sherri's husband, mike, had to pick up the kids because for some reason, sherri was a no-show. she wouldn't just fail to discharge her responsibilities? absolutely. she was completely responsible. completely responsible. and you thought what? i didn't know what to think. josh mankiewicz: when kristin left work, she got back on the phone with mike. mike and i talked many times that night about calling hospitals, and i didn't know what had happened. but i knew that's probably the first place we needed to start looking was, you know, emergency rooms. he told me he was calling hospitals and looking for a jane doe. josh mankiewicz: mike called the ventura police department, too. mike dally: my wife dropped my boys off at school at 8:30 this morning. she's been missing since. i called the hospitals. i called the highway patrol. she's gone. officer: where was she supposed to be? mike dally: at home.

josh mankiewicz: at home with her boys and the children she watched after school. the officer wanted mike to rule out all possibilities and told mike he should call sherri's family before filing a missing persons report. and so mike did. he called sherri's parents' house. they lived 90 miles north and then called the officer right back. mike dally: nobody's at home up there. officer: hmm. ok. well, this is unusual. mike dally: for her, this is way unusual. josh mankiewicz: the officer took sherri's information. officer: what is her mental condition? she have any psychological disorders? mike dally: no, perfect health. officer: mentally? mike dally: perfect. she's stronger than i am. officer: does she have any scars, marks, or tattoos? mike dally: no tattoos, no scars. just a pair of beautiful blue eyes. [music playing] josh mankiewicz: where could sherri dally be? debbie english, who lived two doors down the street

from mike and sherri, was pulling into her driveway when she saw mike's family. they told me that sherri didn't come to pick up the kids from school. and they asked me, do you know where she would have gone? and i said, well, it's monday. she would have went to target. josh mankiewicz: suburban life tends to find its own rhythm. and on mondays, after dropping off the boys at school, sherri ran errands that usually included a stop at target. so mike's sister and niece went to target, and in the parking lot, they found sherri's 15 passenger van, which she used to transport all her daycare kids. what they did not find was sherri. the van was empty. driver's door unlocked and inside sherri's keys and a gift she'd bought for her mom, karlyne guess, karlyne, who at this point, still had no idea sherri was missing. around 8:30 pm when sherri's parents got home,

her mom listened to a voicemail that mike had left on their landline. karlyne guess: he said, this is mike. give me a call. something's happened to sherri. josh mankiewicz: all kinds of terrible things entered karlyne's mind. i thought, was she in an accident? did she have appendix attack? josh mankiewicz: karlyne called mike back. and in an instant, her fears were replaced by one even worse. karlyne guess: he said, she's gone. josh mankiewicz: coming up, sherri dally captured on camera. detectives uncovered security video from inside the store. was she being followed? i was concerned that sherri was maybe abducted or something worse. josh mankiewicz: when "dateline" continues. [music playing] with dupixent, stay ahead of moderate-to-severe eczema. as you welcome the feeling of touch with clearer skin and less itch. the #1 prescribed biologic by dermatologists and allergists,

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in a target parking lot sat sherri dally's van, her personal belongings inside. but no, sherri. it didn't make sense. everything about that scenario went against who sherri was and who she'd been her whole life. [music playing] sherri guess, as she was known until she married, was the youngest in her family. karlyne guess: number two, the completion of our family. we had a boy. and 14 months later, we had our little girl. josh mankiewicz: sherri's mother, karlyne, says sherri was sweet but never a pushover. karlyne guess: spunky. she pretty much put up her dukes when she thought they should be. she was a feisty little girl. josh mankiewicz: karlyne also says it was no surprise that sherri grew up to run a daycare. karlyne guess: she loved, loved, loved kids, and babies, and animals. josh mankiewicz: sounds like she was guaranteed to be a wife and mom someday.

that was her goal. josh mankiewicz: in high school, sherri met the guy who would make it happen, mike dally. back then, everyone called him hawaiian mike, even though he was a local boy. she was so excited because she was going to be able to go out on a date with hawaiian mike. big man on campus. josh mankiewicz: yes. what'd you think of hawaiian mike? i thought he was a nice looking young man. he had good manners. when i told him, you know, what her curfew was, she was in on time. one thing that really impressed me was on sherri's 18 birthday, he had delivered 17 red roses and to come and take her out to dinner that night. then he brought the 18th rose. - in person. - mm-hmm. josh mankiewicz: he's got game. yeah, i thought, this is-- this guy is pretty cool here. and she was clearly crazy about him. oh, absolutely. [music playing] josh mankiewicz: after high school, they moved in together and in 1982 got married.

mike worked full time at a grocery store called vons. sherri worked there, too. and then came the babies. life seemed to be working out just as sherri had imagined. her plan was married by 21, babies by 24. just about. did she deliver on that? yeah, she did, i think, pretty much. mike and sherri lived down the street from his parents on that block where life seemed so perfect. it's where they met neighbors debbie and larry english. debbie english: i met sherri when she had devon and we had robert. and we'd take the kids out to play. and they were the same age. and we just started talking. and we got to be friends that way. thank you, sherri. good job. - you're welcome. what is that? josh mankiewicz: two families growing up together. happy. robert, hold still, please. when we were with them, we had some real good times. we were good friends, just couples, you know, with our kids. and then we both opened up daycares.

and we ran them side by side. and we just intermixed our kids and did field trips with them. and they played a lot together. she loved kids, didn't she? she did love kids. hers and everybody else's yeah, she took good care of everybody else's, too. yeah. and she kept them 24 hours a day. she'd daycare at night. she'd daycare during the day. it didn't matter, whatever the parent's needs were. josh mankiewicz: that's how kristin best met sherri. kristin had just moved to the area and needed help with her girls. she was at the vons where mike worked checking out when she mentioned she was looking for a daycare. he happened to be there and said, oh, my wife's starting up a daycare. and when i called sherri, she said, i don't have any curriculum. your kids will play. i'll take good care of them. just from there, sherri just became, you know, just a trusted, sweet friend in ventura. it was a real blessing for my kids to be at her home. josh mankiewicz: and home was exactly where sherri loved

to be with mike and her two boys until that monday in may 1996 when sherri went on that routine run to target and didn't return. her friend kristin, who'd been helping mike look for sherri, let her mind go to a very dark place. i was concerned that sherri was maybe abducted or something worse. josh mankiewicz: sherri's friend, debbie, told police about a conversation she'd had with sherri a few weeks prior when sherri said a scuzzy looking man had followed her around at the target. by then, ventura pd had checked out sherri's van. they found neither blood nor signs of any struggle. police also pulled target security video. and there was sherri at the register and then exiting the store at 9:22 am. the cameras caught nothing unusual inside the store,

but outside, people in the target parking lot saw something else. coming up, a witness with an alarming story. matt harvill: she saw this person being arrested in the parking lot that matched the description of sherri. arrested like cuffed and locked up? matt harvill: like car pulls up, somebody gets out, walks up to sherri and puts handcuffs on her. josh mankiewicz: when "dateline" continues. [music playing] (♪♪) 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.

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reserve is widely expected to lower interest rates. >> firefighters on both coasts battling dangerous blazes from philadelphia to new hampshire. >> in israel, in el paso, from msnbc world headquarters. >> monday's inside with jen psaki at eight, the rachel maddow show at nine, and the last word with lawrence last word with lawrence o'donnell at ten on msnbc. losing a child, even for a few minutes, can make any parent breathless with fear. are we gorgeous? josh mankiewicz: and it doesn't matter if your child is five or 35, as sherri dally was when she disappeared. for her mom, karlyne guess, it was simply torture. as time goes on and you don't hear from her-- yeah, it's terrible. it's got to be the worst.

karlyne guess: yep. i mean, there's no feeling like that, is there? no, and it never changes. it's always, always there, right here. we just wanted to find her. it was like, ok, she's disappeared, been snatched. let's find her. let's get her back. let's get her home. josh mankiewicz: cell phones were a rarity back then, so karlyne did what she could. you put in a second phone line. yes. because? i wanted my phone that she knew open, and i wouldn't let anybody call on that phone line that she knew. the second day, i had a new phone line put in. if she called, you didn't want her to get a busy signal. right, exactly. josh mankiewicz: while sherri's mother was waiting on the phone company, detectives from the ventura, california pd were hearing about her daughter's case in their morning briefing. detective matt harvill was there. one of the big items on that watch report

was this missing person. and the sergeant actually pronounced the person's name, sherri "daily." and i thought, well, that's kind of pretty close to somebody that i've known from high school. and i said, well, is it sherri dally? josh mankiewicz: turned out, it was sherri, harvill's friend from high school. eventually, every detective they had was put on the case. only one had a personal connection. you knew her in high school, which means you also knew mike in high school. matt harvill: i knew mike, yes. mike was kind of the big man on campus kind of guy. he acted like that. he drove a black monte carlo. i went to ventura high school. there was a street that bifurcated the school, divided it in half. and he would cruise down that street at lunchtime. yeah, he was that guy. he was that guy. josh mankiewicz: matt harvill thought he was the right detective to talk to that guy. i let the group know, the detectives and the sergeant know that i know sherri. i know mike. i would be probably the logical choice to go over and speak to mike about his missing wife.

josh mankiewicz: before harvill and his partner, detective sean conroy, could head out, an officer who'd been listening in on the briefing spoke up. the officer said her sister had been at the target the day sherri was seen on security video buying a gift for her mom. and then outside the store, the officer's sister witnessed something that caught her attention. saw this person being arrested in the parking lot that matched the description of sherri. arrested like cuffed and locked up. matt harvill: cuffed and locked up. like car pulls up as sherri's getting in her van. somebody gets out, walks up to sherri, and puts handcuffs on her. not a marked car, so presumably a detective. not a marked car. exactly, presumably a detective. the detective's a man or a woman? female. josh mankiewicz: other witnesses later described the detective as a blonde. and she holds sherri's head as sherri is getting put in the car. just like you'd see on tv. josh mankiewicz: sherri dally, arrested?

hard to believe, thought harvill. well, that doesn't sound like the person i knew over the years. i presume you guys would know if your organization, the ventura police department, had her in custody. right, we would. how many other law enforcement agencies are around that might have taken her into custody? that could be a very long list. it could be oxnard police department, simi valley. it could be a federal organization, california department of justice. josh mankiewicz: detective conroy was relieved. he thought they'd find sherri quickly because one of those agencies must have something on her. we started running her name to see if there were any outstanding warrants. josh mankiewicz: nothing turned up. harvill and conroy hoped their visit with mike dally would provide some answers. when you're talking to mike, does he remember you from high school? does he say, hey, how you been? i didn't know you were a cop now. no, he knew i was a cop. yeah, you know, he knew me. hey, matt. how are you doing? we walked around the house. i looked for signs of, well, maybe there was a domestic here. maybe they have fight. things were thrown around. nothing like that. house was clean, nothing out of place.

josh mankiewicz: mike said he didn't know what had happened to his wife. i'm guessing that when you talk to mike, one of the questions you ask him is who did not like your wife? who was angry at her? who had done this? who might have done her some harm? i don't know. everybody likes her. - that seemed to be true. - it seemed to be true. yeah, it was very true. you know, i asked him if they had any issues, any problems. no, nothing, nothing out of the ordinary. i think he said something like, you know, the normal stuff between husbands and wives. well, that covers a lot of ground, doesn't it? that does cover a lot of ground, absolutely. josh mankiewicz: then detective harvill explained to mike dally how these cases usually go. matt harvill: i told him, you know, mike your wife is missing, and the way we normally conduct these investigations is we look closest to the home. we start there and work our way out. so we're going to do a deep dive into your relationship with your wife and what's going on in your life. i got to say, i love the question just in terms of tradecraft. hey, look, this is how we do it. we start close to home, and we go outward.

so we're going to look at and your relationship with your wife. is there anything that's going to surprise me? because you must get all kinds of answers to that. you do. you get all kinds of answers. josh mankiewicz: the answer he received that day was one matt harvill did not expect. coming up-- is there anything that i should know about? he says, well, i do have this girlfriend. mike dally comes clean. on an extramarital affair. once she found out, she came to me. and i just held her while she cried. josh mankiewicz: when "dateline" continues. [music playing] if you take or have taken humira for moderate to severe crohn's disease or ulcerative colitis and still have symptoms... you don't have to settle. ask your gastroenterologist if switching to rinvoq is right for you. it's one of the latest treatments from the makers of humira. rinvoq works differently than humira and may help. rinvoq is a once-daily pill that can deliver rapid symptom relief, lasting steroid-free remission,

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1-800-290-7477 now or visit us at fund.com. >> hi, i'm richard lui with a news update. >> there are 11 confirmed killed in the southern california wildfires, but that death toll is expected to rise. >> more than 12,000 structures were destroyed so far, and evacuations continue as fires spread across the greater los angeles area. >> the two largest, the palisades and eaton fires, are

less than 10% contained right now. some good news wind speeds are dying down, giving firefighters a chance to make some headway. headway. >> meanwhile, residents returning to their neighborhoods to see what remains of their smoldering homes. smoldering homes. >> for now, back to dateline. in any investigation, detectives need to learn everything they can about the victim and those closest to them. sometimes that requires digging. other times, an honest answer to a simple question is all they need. detective harvill tried asking a simple question of mike dally. matt harvill: is there anything that's going to surprise me or anything that i should know about? and he says, well, i do have this girlfriend. josh mankiewicz: a girlfriend? oh yes. and it got better. mike said her name was diana, but her last name, mike said he just couldn't recall it. where does she live?

uh, i don't know. but i can give you her phone number. so he gave me her phone number. so you're having an extramarital affair, but you don't know the last name of the woman you're doing it with. and you don't know where she lives. right. it's the ultimate no-strings-attached relationship. that would be the ultimate. yeah. josh mankiewicz: harvill and conroy took that information back to the station and compared notes with other detectives. turns out when mike reported sherri missing, he never mentioned a girlfriend. officer: are there marital problems? mike dally: no. josh mankiewicz: mike also told another officer he and sherri had just returned from a jet ski trip and everything was going along fine. however, sherri's mother had noticed mike being short and dismissive with sherri sometimes. and truth is karlyne had wondered if sherri was the one who had something else going on. i thought, it's not like her, but maybe she had a boyfriend and just decided that she wasn't going to put up with michael anymore. and in some part of your head, you're thinking,

i hope that's true. i did. i thought, i hope that's where she is. josh mankiewicz: sherri's friend and neighbor, debbie english, said sherri had talked about walking out on mike. she said, i ought to just go and leave for a couple of days, not tell him where i've gone so he could see how it feels, the way he's doing me. josh mankiewicz: because sherri did know about diana with no last name. and sherri had told debbie all about her. once she found out, she came to me, and she was crying and told me what had happened. and i just held her while she cried. josh mankiewicz: kristin also knew about diana and said she was afraid of what sherri might do. sherri was a strong girl and could take somebody down. you know, i used to say, sherri, i don't want you to end up in jail, you know. you thought she might physically attack diana. mm-hmm. i did. josh mankiewicz: according to her friends, sherri did confront diana after sherri heard diana not only wanted mike but the kids, too.

and so sherri gave diana a piece of her mind. and she told her she'd never get them, just to back off. and she told her you weren't getting mike either. she would fight her for mike. josh mankiewicz: because in sherri's mind, the problem here is diana is the interloper, and mike is blameless. absolutely. the problem was diana. you know, if diana would just go away, then everything would be back to normal. josh mankiewicz: well, that didn't happen. diana didn't go away. but now sherri had. the question was where. sherri was last seen exiting target. security cameras confirmed that. then there were the witness reports of a woman believed to be sherri, who was arrested just outside of target by a blonde female cop, except detectives couldn't find any record of that arrest anywhere. and now there were some things about the arrest itself that just didn't feel right to these detectives.

first of all, the arresting officer seemed to be working solo. typically, if i was going to go out and make an arrest, i'd have a partner with me because i don't know how the person is going to respond. and this officer was alone. alone. josh mankiewicz: then there was the car the officer put sherri into. back then, nearly every cop drove a ford crown victoria. not this one. it wasn't a crown vic. which was, at the time, certainly the preferred car of all law enforcement agencies. you always knew it was a cop in the parking lot if you saw a crown vic. josh mankiewicz: another anomaly, sherri's driver's license was found inside her van. and if sherri had been taken into custody, it's hard to believe that her id, her driver's license, wouldn't go with her. yes, exactly. i mean, that's one of the common things that you collect from a person to get all their correct information so you they're not lying to you. josh mankiewicz: to police, what witnesses saw outside the target was beginning to look less like an arrest and more like an abduction. that is such a bold move.

i mean, what kind of motivation would a person have to take that kind of risk to do that in a public place and to go forward with that plan? it's like something out of a movie. well, it's like something out of a bad movie because it was reckless. josh mankiewicz: so who was that blonde woman who'd handcuffed sherri dally, and where did she take her? detectives wondered if mike's girlfriend, diana, could have had anything to do with it. with only a first name and a phone number, harvill and conroy set out to find her. and we started researching that phone number. who does it belonged to? so we looked it up, got an address in port hueneme that goes with that phone number. josh mankiewicz: first name, diana, last name, haun. harvill and conroy began their first full day on the case with a drive down the coast to port hueneme to knock on her door. coming up-- matt harvill: there's diana standing in front of us in a very short, black negligee. and she's not alone.

matt harvill: she's not alone. josh mankiewicz: well, he was telling the truth about having an affair. we confirmed it right there. josh mankiewicz: detectives would also confirm something else about mike dally. he had a rock solid alibi. josh mankiewicz: when "dateline" continues. [music playing] the freestyle libre 3 plus sensor tracks your glucose in real time, and over time it can help lower your a1c. ♪♪ this is progress. learn more and try for free at freestylelibre.us ♪♪ gold bond believes touch says everything. it says... i see you. i feel you. and...i know you. gold bond. get in touch with irresistibly touchable skin.

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loyalists. don't miss the weekend, saturday and sunday mornings at 8:00 on msnbc. >> to understand more with >> to understand more with msnbc. after sherri dally went missing, detective matt harvill told her husband mike how homicide detectives start close to home, meaning they'd have to look at mike. when they did, detectives confirmed mike was at work at the same time sherri was getting cuffed and taken from the target parking lot. he was stocking the shelves at vons, and he had a rock solid alibi. josh mankiewicz: there was the matter of mike's girlfriend, diana. that kind of thing never plays well with homicide detectives. however, it's common for guilty husbands to avoid mentioning their secret lives, not mike. he'd been quite candid about diana, although he said he didn't know

her address or her last name. didn't matter. harvill and conroy were detectives, after all, and they found diana's home address. matt harvill: we drove out to diana haun's house. and we get there, and the first thing that strikes me as we pull up is mike's van is in her driveway. and he's not only with his girlfriend, he's found out where she lives. it was a miracle. josh mankiewicz: it was a party waiting to happen. we go up to the door. we knock, and nobody's answering. josh mankiewicz: detective conroy called diana's home phone. she picked up, and he said something along the lines of it's the police. we're outside. moments later, the door opened up, and there's diana standing in front of us in a very short black negligee. just out of bed. matt harvill: apparently so. josh mankiewicz: and she's not alone. she's not alone. and matt and i step into the residence. and matt just calls out, you know, hey, michael, come on out here. and mike came walking out of the back part of the house wearing a pair of boxer shorts.

well, he was telling the truth about having an affair. he wasn't lying about that. and we confirmed it right there. [music playing] josh mankiewicz: so, yes, mike was honest. that did not get him off police radar. because he's supposed to be at home waiting for the phone to ring, you know, in case a hospital called that they had his wife or just anything when he's actually at the very first opportunity spending the night with his girlfriend. josh mankiewicz: detectives wanted to find out if mike's girlfriend knew anything about sherri's disappearance. mike offered to drive diana to the police station. it was there that detectives separated the lovebirds and sat diana in an interview room. sean conroy: what our goal in that interview was to establish a baseline of her activities on the day of the abduction. so we asked her to fill out a yellow legal pad with all of her activities. josh mankiewicz: diana said she was alone most of the day. matt harvill: she put in there she

went on this long bike ride. that was a big chunk of her day. that was the day sherri disappeared. that's the day that sherri disappeared. josh mankiewicz: by diana's account, this bike ride took her nowhere close to the place where sherri was last seen. what's more, the eyewitnesses described the person who put sherri in the car as a white female with blonde hair. it was hardly an accurate description of diana haun. long, dark hair. long, dark hair. yeah. and she's half asian. half asian. yeah. she doesn't sound at all like the person that arrested sherri dally. no. josh mankiewicz: detectives ran diana's name and found nothing alarming. diana haun had no criminal record. no. never been in trouble with the law in any way? no, nothing. josh mankiewicz: at 35, diana haun lived with her mother. at one time, she'd had ambitions to be an actress or model. she now worked in the deli department at the same vons as mike dally.

police spoke with colleagues who said diana told them that she occasionally practiced witchcraft. aside from that, it seemed the most exciting thing in diana's life was the spell she'd cast on mike dally. diana told police she was fully aware that mike had two boys and that he was married. she also told them sherri was well aware of her. she did admit to, you know, the confrontations, that they had had words. so she knows sherri, and sherri definitely knows her. josh mankiewicz: if the person who handcuffed sherri was diana haun, wouldn't sherri have recognized her and refused to go along? two days into their investigation, diana haun was coming off as too soft spoken and too meek to be a kidnapper. because she's not aggressive. she's not mean. no, she hasn't threatened anybody. she's never been in physical confrontations. josh mankiewicz: at the same time, in the world outside that little room,

the story of what happened to sherri was spreading. and soon it caught the attention of someone who knew diana. and that moment changed the course of this investigation. a co-worker of hers called into the detective bay and spoke to another detective. josh mankiewicz: diana's co-worker told the detective she'd seen diana the day after sherri was reported missing, and she'd noticed something peculiar. she said her face was all red, and she looked like she'd been in a fight. and there were scratches on her forehead. josh mankiewicz: the detective hung up the phone and went to the interview room where harvill and conroy were questioning diana. he knocks on the door. and he goes, did you see the scratches? and we were looking. and she had her hair done in kind of a surfer wave over the forehead deal. and so we hadn't seen them. we go back in, and we say, hey, you know, move your hair to the side. josh mankiewicz: there they were. diana said she could explain. she got the scratches during her long bike ride

the day sherri disappeared. matt harvill: she says she was riding back to her house and a couple of guys in a black pickup truck ran her off the road. and she crashed. did she had road rash on her hands-- no road rash on her hands. --or any other injuries that might be associated with falling off a bicycle? no raspberries on the elbow or the knees, nothing like that. josh mankiewicz: still, with no real evidence, there was nothing detectives could do at that point. and so they let diana haun walk right out of the police station, along with mike dally. coming up-- wherever she was, she was being held against her will or worse. josh mankiewicz: frantic searches for sherri, and a rental car brings in a brand-new lead. the rear-view mirror had been broken off. suggesting a fight inside the car. that's definitely what we believed. josh mankiewicz: when "dateline" continues. [music playing]

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1-800-290-7477 now or visit us 1-800-290-7477 now or visit us at fund.com. sherri dally had vanished. her case was all over the local news. our top story here at 5:30 today. the search for a missing woman in ventura. she's a mother of two. she also runs a daycare center in her home. josh mankiewicz: sherri's husband, mike, spoke with reporters. this is so bizarre. and everybody, my neighbors, our friends, they all just can't believe it because they all know her and say, no, she would never leave the boys for any reason. josh mankiewicz: even sherri's boys went on tv. will you help us find our mom, please? josh mankiewicz: los angeles station kttv was there when mike took his sons to hand out flyers at the target where sherri was last seen. that's your mom. yes. josh mankiewicz: everyone who loved sherri was holding their breath. every time the phone rings-- you're grabbing it. yep, at work and at home. and they didn't have cell phones then. and they didn't have caller id.

no. so you don't know who it is. so every call could be her. yes, every call you hope is her. your brain is saying one thing. your heart is saying another. and then we get to the weekend. and it's-- sunday is mother's day. and monday was my birthday. and you didn't hear from her. and i didn't hear from her. and i knew that wherever she was, she was being held against her will or worse. josh mankiewicz: soon, the whole town seemed to be coming together to find sherri dally. people talked about it all the time. and so there was community people who wanted to help find sherri. josh mankiewicz: kristin helped organize search parties. we all have kids. we all-- you know, if you're a mother, you can identify with a daughter missing. and i think that there's just concerned people. and that's the big connection here. josh mankiewicz: the target parking lot where sherri was last seen became their command center. and we just would split up into groups and covered, you know, different parts of the county.

josh mankiewicz: as the weeks went on, they all knew the odds were increasingly longer that sherri was still alive. kristin best: by this point, we were thinking that the worst may have happened. and so we were looking at the river bottoms and out in the rural areas. places where a body might turn up yes, absolutely. my phone number was kind of the contact one. so i used to get a million calls of, you know, psychics saying she's by a water tower. i see her. she's by, you know, whatever. and i don't believe any of those panned out. but we did at some point have the psychics join us as we were searching as well. and even though you didn't necessarily believe that, you'd check it out. absolutely, absolutely, yes. josh mankiewicz: debbie and larry searched, too. we were hoping we would find her. but as far as devon and i concerned, we were hoping it wouldn't be us. we didn't want to see her in any kind of bad condition. no, you want to find her, but you don't want to be the one to do it.

josh mankiewicz: karlyne hoped sherri would be found alive. detective harvill knew all the signs pointed the other way. karlyne asked if we thought that sherri was dead. and it wasn't looking good. and you were honest about that. i was honest about that. i really was. josh mankiewicz: harvill felt he had to be because for him, this case was different. most homicides, i arrive on scene, and we have the decedent. i didn't know the decedent beforehand, so i can't put a personality, a voice, anything to that unfortunate victim. sherri was a different story. you know, i can put a voice to it. i can put a smile. i can put a kind word to this person. that make your job easier or harder? it didn't make it easier. i'd say it added another level of almost pressure to what i was doing and that i needed to do the best i could for this person

that i knew as a friend. josh mankiewicz: all the while, detectives just kept at it. they knew they needed to find the car sherri had been put into. witnesses described it as a small, teal-colored sedan. detectives looked high and low. two of the detectives that were working this case, they went to local rental places. and one of the closest was the oxnard airport and just started going from counter to counter. josh mankiewicz: it took a while, but they found it. the budget fleet contained a blue-green nissan altima that had been rented out during the time sherri was abducted. and according to budget records, it was returned damaged. the rear-view mirror had been broken off. the inside rear-view mirror. inside rear-view mirror. suggesting a fight inside the car. that's definitely what we believed, that a fight had occurred inside the car. josh mankiewicz: by this time, the car had already been repaired and rented to another customer.

it was one more day before detectives got their hands on it. when they did, they could see with their naked eyes stains that to them looked like blood under the floor mat in the back seat. the crime scene investigators cut the seats and peeled it back, and you could see the blood had soaked into the seats. josh mankiewicz: also, inside the car, some strands of blonde hair. detectives believe the blood found inside the sedan had to belong to sherri dally. and to them, that confirmed the worst. once you get that evidence back from the car, you know. we know. sherri dally is dead. yes. the only question is where she is. where is she? josh mankiewicz: so who to ask? maybe the person who'd rented the car. budget faxed over the rental agreement. and the name on the contract, come on, you've already guessed. [music playing] it was time for detectives to have another talk with diana haun.

[laughter] josh mankiewicz: this conversation sounds like two people chatting it up at a bar. josh mankiewicz: in reality, it was anything but casual. detectives were questioning diana haun again now that they learned she had rented this car that seemed to be the one used in sherri's abduction. there was at first no mention of any rental car, just some questions about what diana was like in school. a josh mankiewicz: diana told them she had only one friend growing up and that these days mike dally was her closest friend. and then more than a half hour after it began, this interview got serious. they showed her some photos--

josh mankiewicz: and a document. diana haun had not only signed it, but had initialed it because it said, do you want this waiver, initial here in like five different places. josh mankiewicz: the form even had vons written in as her workplace. it was the big break in the case. it's not exactly a signed confession, but it's pretty close. well, it basically said, take a big old look at me. josh mankiewicz: they read diana, her miranda rights. josh mankiewicz: she did not ask for an attorney. so they kept going. josh mankiewicz: detectives told diana how at that exact moment other cops were searching her home. they also told her they didn't believe her bike ride alibi. they asked again and again, where is sherri?

to be pretty, diana. >> i can guarantee you it will not be pretty. this is your not be pretty. this is your opportunity to show us, to show josh mankiewicz: diana sat quietly. >> we need to go get the car. >> we need to point the way and take us to sherri. >> that is the only thing you can do that is going to help can do that is going to help with this josh mankiewicz: the interview was going nowhere. conroy and harvill got up to leave the room. and then conroy had another question. and that gave us access to the purse.

and that was a seminal moment in the investigation with diana haun. josh mankiewicz: in her bag was a startling piece of evidence, a photograph of diana and mike dally with his two boys, essentially a family photo, except they weren't a family. at the time, he's still married to and living with the mother of those kids. exactly. [faint speech] josh mankiewicz: after they saw that picture, the detectives went back in and confronted diana. two kids and their father? i think that being in the photo, that's realizing her dream. that's the life she wanted. that's the life she wanted. josh mankiewicz: there was just one thing standing between her and her dream.

josh mankiewicz: there was no evidence mike dally had ever filed for divorce. and by now, detectives had spoken with diana's colleagues who told them some odd stories. to make a human sacrifice? josh mankiewicz: diana said she couldn't remember her exact words, but a woman at work did. josh mankiewicz: detectives knew sherri had disappeared just weeks before mike's birthday, and so they wondered instead of buying mike a tie or some aftershave, maybe diana's gift was murder because, said detectives, diana was obsessed with becoming mike's wife and mother to his children.

where would you draw th josh mankiewicz: coming up. things heat up in the interrogation room, but not in the way detectives expected. matt harvill: diana was almost in a trance. he just pumped her up. it was amazing to watch. josh mankiewicz: when "dateline" continues. [music playing] this is wild alaskan company. wild caught, high quality seafood sustainably sourced from the pristine waters of alaska, frozen at the peak of freshness and delivered directly to your door with wild alaskan company. the natural, delicious flavor is

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mike himself, you'll remember, had an alibi. he was at work when sherri was abducted, and he could prove it. still, detectives had reason to wonder if he might be involved. they pushed diana, trying to see if she would say anything to implicate mike. and we said at some point, he's going to leave you holding the bag. that's the plan. he has a rock-solid alibi. you know, you don't. at some point, he's going to have to give you up, you know? you're going to take the fall. and put away and left until he and put away and left until he is ready to come play josh mankiewicz (voiceover): they kept chipping away at diana as she tried to defend mike, her married lover.

to you. you don't want to see that in him because you know that in him because you know you're josh mankiewicz: you guys are rolling out the heavy artillery. he's using you. he's taking advantage of you. he's going to get you to take the fall for something that's his idea. it really is almost like watching a tv show. [laughs] except it doesn't work. it didn't work. she wasn't giving us an inch. josh mankiewicz (voiceover): they needed a different strategy, and one soon presented itself. mike had come in to talk with detectives that day, and he was in the room next door. and while detective conroy was filling out diana's arrest paperwork, diana heard mike's voice.

>> will i be able to see him? >> will i be able to see him? >> i don't sometimes you put two potential suspects in the room together, and something incriminating comes out. josh mankiewicz (voiceover): police already knew mike dally and diana haun were lovers. now, they were hoping to find out if mike and diana were also partners in murder. so they let the couple bond in an interrogation room. josh mankiewicz (voiceover): it was clear mike and diana knew this was not a private conversation because as they spoke, they sometimes whispered. josh mankiewicz (voiceover): at other times, it appeared mike wanted the detectives to hear exactly what he and diana were saying.

josh mankiewicz (voiceover): she meaning sherri, who knew diana by sight and who certainly would never have willingly gotten into a car with her. mike tried to reassure diana, or maybe he was trying to help her get her story straight here. you can't. >> just hand me. you can only tell him the truth. okay. that's. all you can do is tell that's. all you can do is tell him the truth. and. josh mankiewicz (voiceover): on a video feed, detective harvill watched it all unfold like a soap opera.

diana was almost in a trance. he came in there, and he just pumped her up. you could see her just almost physically just get pumped up as he's getting her to focus on him. she's like drawing from his strength. absolutely. it was amazing to watch. josh mankiewicz (voiceover): diana and mike seemed to have their very own love language. josh mankiewicz (voiceover): mike told diana the detectives had it all wrong. diana wasn't guilty of anything because sherri was not dead. josh mankiewicz (voiceover): mike told diana not to worry about getting locked up.

josh mankiewicz (voiceover): detectives hoped putting mike and diana together might cause him to incriminate himself or cause her to crack and confess. josh mankiewicz (voiceover): mike's behavior certainly made them suspicious, but it was nothing for which he could be arrested. now. josh mankiewicz (voiceover): as for getting diana to crack-- we go back in there, and it was like we were back at the beginning of the interview. i mean, all the ground that we gained was just gone. josh mankiewicz (voiceover): detective conroy tried again. this time, he confronted diana about a piece of paper

they'd found in her purse, one that had sherri's name on it, along with banking information. diana explained she was simply helping mike pull money out of sherri's account because mike was struggling financially. missing, kidnaped to try to get money from the account. >> that's not what we think. >> we think she ran off. >> she ran off. >> she left him with all his bills. bills. >> left him with all the we were looking for a way to get her to let go of mike. and start seeing the world the way it really was. sean conroy: exactly. this was going to be a reality check. this was reality hitting you fast and hard. and mike's not here to save you. josh mankiewicz (voiceover): none of it worked.

diana haun didn't spill. she may have saved mike, but not herself. sherri's mom heard the news, an arrest in her daughter's case. and you thought, what? who the heck is this woman, and what does she have to do with sherri? you've never heard that name before? nope. i can't tell you anything about it because i don't know anything. josh mankiewicz (voiceover): mike did not seem eager to answer reporters' questions. i have nothing to say. there's nothing going on. reporter: did you know ms. haun at all? like i said, guys, you guys know as much about this thing as i do right now. reporter: i mean, she may have been the one who actually killed your wife. josh mankiewicz (voiceover): then, just days after diana's arrest-- reporter: diana, do you feel like you were falsely accused of murder? josh mankiewicz (voiceover): --she was released. sherri's good friend, debbie, was astonished. how could they let her go, you know? we all know she did it.

josh mankiewicz (voiceover): the ventura county district attorney's office decided there was not enough evidence to charge diana haun with a murder in which there was no body. you might think detectives would be upset by the da's decision. you would be wrong. you're not disappointed by that? - no. - you're ok with that? i thought it was great. and not only that, but when she was released, it was a media zoo at county jail. josh mankiewicz (voiceover): that meant all of ventura would get a good look at diana haun. and it turned out, that was just what this investigation needed. coming up, a new witness. i recognized her face right away. she purchased a wig. reporter: what color? blonde. josh mankiewicz (voiceover): bull's eye. diana haun fooled her. enough to get the handcuffs on her and get her out of that parking lot. josh mankiewicz (voiceover): when "dateline" continues. [suspenseful music]

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1-800-290-7477 now or visit us at mso fund.com. >> donald trump plans to reshape the u.s. government as we know it. >> democrats have wasted no time in laying the groundwork to fight the incoming trump administration. >> the conversation right now is like, oh, we have to win back working class voters. but who are people talking about? >> it's no surprise that this is a time of reflection and reassessment for democrats. >> donald trump wants a presidential cabinet full of loyalists that are going to push through his extreme agenda. >> don't miss the weekend, saturday and sunday mornings at saturday and sunday mornings at eight on msnbc. josh mankiewicz (voiceover): police suspected diana haun of posing as a detective and kidnapping her romantic rival, sherri dally, in broad daylight. the question was, why didn't sherri recognize diana and just walk the other way? when police searched diana's home,

they thought they'd found their answer. there were photos in there of diana haun made up to the point where i didn't recognize the person in that photo as being diana haun. josh mankiewicz (voiceover): photos like this headshot, which indicated maybe diana had learned enough in her brief modeling and acting days to pull off a disguise. it was certainly true that tying her to the crime scene had been a reach. eyewitness descriptions did not match diana, until she got out of jail, and her picture appeared on the local news. i recognized her face right away. josh mankiewicz (voiceover): nbc station knbc interviewed this woman after she spoke with detectives. recognized the picture of diana haun and even commented about the family photo that was in diana's wallet. josh mankiewicz (voiceover): yes, this one. so the new witness had seen diana, all right.

but even more important was where the witness worked-- at a shop that sold wigs. she purchased a wig. reporter: what color? blonde. [suspenseful music] josh mankiewicz (voiceover): remember the blonde hair found in the rental car? lab tests revealed it wasn't sherri dally's. it wasn't even human. it was from a wig. detectives also found a store that had sold diana haun handcuffs and a badge. and they also found something most killers don't do-- write personal checks. josh mankiewicz: what kind of murderer does all their prep work and pays by check? not a very smart one. josh mankiewicz (voiceover): diana also wrote a check to kmart, where she bought a lady's jacket, sunglasses, and an axe. there was also another witness who is walking through the parking lot. he was very detailed in what she told us.

definitely a female. female is wearing, like, pancake makeup, obviously disguised. josh mankiewicz (voiceover): obvious to that witness, maybe not to sherri dally. josh mankiewicz: sherri had seen diana haun face to face. she knew her and didn't just know her-- i think hated her. and diana haun still fooled her. diana haun fooled her for a brief period of time. diana haun was out of context. josh mankiewicz: and she changed her appearance enough that it fooled sherri. exactly. enough to get the handcuffs on her and get her out of that parking lot. [suspenseful music] josh mankiewicz (voiceover): all of that added up to a lot of circumstantial evidence against diana haun, but not enough to re-arrest her. police needed to find sherri. detectives believed she wasn't far away. records from budget revealed diana only drove that teal altima 126 miles over the three days she had it.

it allowed us to give the volunteer searchers some parameters for where they needed to look. like, this isn't going to be in reno. exactly. josh mankiewicz: yeah. josh mankiewicz (voiceover): california's ventura county is nearly twice the size of the state of rhode island, meaning there was a lot of rugged terrain still to search. sherri's friends and people she'd never even met had been out on foot, weekend after weekend, turning up nothing. they never gave up. on saturday, june 1, four weeks after sherri disappeared, her friend kristen was again out with a search party. parked the car, and we walked along this area for about 45 minutes. and then i saw her sunglasses on the side. and, um-- and i knew they were her sunglasses. josh mankiewicz (voiceover): at the side of the road was a steep drop. so a couple of the guys from our group

went down into the ravine. josh mankiewicz (voiceover): the guys held up a pair of black shorts. and i just said, that's hers, you know? that's-- that's hers. reporter: volunteers who'd been combing this area for weeks found sherri dally's skeletal remains here. josh mankiewicz (voiceover): detectives had already seen the bloodstains inside the rental car and had learned of the broken mirror that had been repaired. soon, sherri's autopsy report completed the picture. i believe that there was a hellacious fight in that car. josh mankiewicz (voiceover): police believe before the car was out of the target parking lot, sherri dally figured out who was driving. josh mankiewicz: that has to be a horrible moment of realization for sherri. this person who's just arrested her isn't a police officer. it's her husband's girlfriend. i can't imagine what was going through sherri's mind at that moment. [tense music] josh mankiewicz (voiceover): the detectives suspect sherri somehow slipped her handcuffs to the front. and the fight was on.

sherri dally bravely fought for her life and fought for her family. sherri's hands are handcuffed, but she's grabbing onto diana haun. she couldn't drive through town with sherri fighting her from the back seat of the car. so diana haun was forced at that time to subdue her. [dramatic music] josh mankiewicz (voiceover): these detectives believe that by the time the teal nissan exited that parking lot, the fight was over, and sherri dally was either dead or close to it. she was beaten, and she was stabbed. she was stabbed, absolutely. there were some nick marks on ribs, which the medical examiner was able to conclude were caused by a knife. josh mankiewicz (voiceover): there were knife holes in the bits of clothing found with sherri's remains. now, those who loved sherri could say goodbye. mike came to that memorial and brought along his and sherri's boys.

he came in reasonably late, with a kid in each hand. and he just swaggered on in and sat down. josh mankiewicz (voiceover): mike's swagger was apparent to detectives, who were also in attendance. josh mankiewicz: does he know he's under suspicion at that point? he has to. i'm sure he does. josh mankiewicz (voiceover): they also knew it was unlikely the girl voted most shy in school had planned a brutal, complicated murder on her own. detectives were convinced mike was deeply involved in this. i believe that mike thought he was teflon-coated. i think all the way through this, he thought he was just teflon-coated. this was just going to slide right off him. in the same way that he sort of felt he never had to even hide his relationship with diana haun. exactly. he didn't make us hunt for it. if you're committing a murder, you sort of have two ways to go, right? you can try to guarantee that you'll never

be a suspect, which is pretty tough if you're the victim's husband. or you can try to guarantee that there will never be a good enough case against you. right. and i think michael believed that he was smarter than we were. josh mankiewicz: well, he was wrong about that. yes, he was. josh mankiewicz (voiceover): coming up, a look inside sherri's marriage, and the view is dark. he had this pillow of diana haun on his bed. he wouldn't let her remove that from the bed. so every time she gets in that bed, there's three people in it. yeah. josh mankiewicz (voiceover): when "dateline" continues. [suspenseful music] 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 ♪

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headquarters. >> msnbc premium gives you early access and ad free listening to rachel maddow. chart topping series, msnbc original podcast's exclusive bonus content, and all of your favorite msnbc shows now ad free. subscribe on apple ad free. subscribe on apple podcasts. [suspenseful music] josh mankiewicz (voiceover): when diana haun was released from jail, many people close to sherri dally were frustrated at that thought that somehow diana had won. she wanted to get rid of sherri so she could have mike. josh mankiewicz (voiceover): sherri's friends wanted diana back behind bars. and after her release produced some new witnesses, they soon got their wish. reporter: a frowning diana haun being transferred from the ventura police station to the county jail. it's not the first time she's been in custody, but officials believe this time, she'll stay there. josh mankiewicz (voiceover): sherri's friends also hoped to see mike heading to the county jail.

he didn't love diana haun. he didn't love her at all. you don't think so? no, he used her as a pawn. he wanted her to do his dirty work. once it was done, he would pretty much be free and clear. josh mankiewicz (voiceover): mike still had that alibi. but remember what detective matt harvill told mike right from the start? i told him that we look closest to the home. josh mankiewicz (voiceover): when they did, they found that sherri dally's life was hell courtesy of her husband. josh mankiewicz: there was no evidence of physical abuse-- no. --by mike against sherri. but there was plenty of evidence of all other kinds of abuse. the picture that we put together was that it was an extremely emotional, abusive marriage. sherri would get up at 2:00 in the morning to warm mike's shower water.

she was more of a role of a servant than a wife. josh mankiewicz (voiceover): and, her friends said, he was mean. he used to tell her she was fat all the time. with other people around? yes, he didn't care. he'd abused her verbally that way. he'd make her feel like she was worthless. [suspenseful music] josh mankiewicz (voiceover): police learned mike would get phone calls and then just disappear, sometimes for days. mike often told sherri the call was from a guy named alex. he would describe alex as a guy he worked with at vons. yes josh mankiewicz (voiceover): sherri's friends say alex occasionally called the house, even speaking with sherri before she'd pass the phone to her husband. at one point, detectives learned mike even moved in with his work buddy, alex. how long until she figured out that was actually the other woman impersonating a man? maybe six months or more.

that's when she found out. she caught them together. josh mankiewicz (voiceover): alex, it turned out, was diana haun. josh mankiewicz: and in that instant, i guess, realized the phone calls, the disappearances, the alex that didn't really exist, that was all about diana haun and her husband getting together? yes. josh mankiewicz (voiceover): friends told detectives that after about five months of living with diana, mike moved back home. and sherri somehow felt the onus was on her to change herself to keep mike. she wanted to lose weight. she changed the way she dressed. she started wearing makeup. she had to make herself more attractive to mike. josh mankiewicz (voiceover): and then there was the pillow. he had this pillow of diana haun on his bed. josh mankiewicz (voiceover): a pillow with diana's photo on it on their bed. sherri could not avoid seeing it.

he wouldn't let her remove that from the bed. and that was their bed. but that pillow had to stay on that bed. so every time she gets in that bed, there's three people in it. yeah. how incredibly insulting. it was. josh mankiewicz (voiceover): by her last christmas, her friends say sherri was pretty much emotionally depleted, and the psychological torture was not over. it was christmas day in the afternoon. and sherri comes to your house and she's crying? she wasn't crying. she was just upset. we tried to get her to stay. and she was really upset and sad. josh mankiewicz (voiceover): sherri confided in her good friends that mike had taken off to spend christmas day with diana, and he took the boys. josh mankiewicz: this is way past the place where a lot of women would just say, if you're going to leave me on christmas day to go to your girlfriend's, you shouldn't come back

yeah, they would have, but sherri didn't. she just didn't want to be without mike. mike was her-- the one she wanted. and that's who she was trying to keep. josh mankiewicz (voiceover): sherri kept all of this from her mother. karlyne only learned of it after sherri was murdered. i have trouble believing that you brought her up to say yes to everything. karlyne guess: oh, no. mm-mm. so what's going on? hindsight, he's the puppeteer, and she was the puppet. and sherri was somehow convinced this is the price of a happy marriage? exactly. this spunky, little kid that would-- you know, if there was a race to be run at the turkey trot for the parks and recreation department, doggone, she was going to win. and she did. and then all of a sudden, she became a meek, controlled woman. emotional domestic violence. that's what this was. that's what this was. josh mankiewicz (voiceover): emotional abuse isn't proof of murder, though there was plenty of circumstantial evidence, like mike

never joining in any of those searches when sherri was missing. and we already know he wasn't waiting by the phone to hear from either sherri or the cops. mike actually called to tell me that he was just needed to get away. and he was going down to dana point or somewhere to jet ski. wait a second. wait a second. with his wife missing? right. josh mankiewicz (voiceover): his indifference spoke volumes. and there was this. sean conroy: the best evidence, i believe, against michael is, how did diana haun know when to be at target when sherri was going to be there? that could only have come from mike. that could only come from mike. josh mankiewicz (voiceover): coming up, the trial begins. was diana haun a killer? josh mankiewicz: sherri's blood in the car she rented, blonde hair that comes from a wig.

correct. josh mankiewicz: and she doesn't have an alibi. lela henke-dobroth: correct. not a plausible one. josh mankiewicz (voiceover): and the defense? just wait until you hear that one, when "dateline" continues. [suspenseful music] did you know... 80% of women are struggling with hair damage? just like i was. pantene miracle rescue deep conditioner with melting pro-v pearls. locks in moisture to repair 6 months of damage. for resilient, healthy-looking hair. if you know, you know it's pantene. [coughing] copd isn't pretty. from the struggle to breathe... to getting stopped in your tracks. bye, grandma. ♪♪ but with trelegy, i can finally move forward. with 3 medicines in 1 inhaler, trelegy keeps my airways open for a full 24 hours and prevents future flare-ups. once-daily trelegy also improves lung function, so i can breathe more freely all day and night.

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wind speeds are forecasted to increase later this weekend. after a short reprieve and following months of delay, donald trump was sentenced in his criminal hush money case friday. >> while he received an unconditional discharge, which means he will not face fines, jail time or other penalties, he will officially enter the white house as the first convicted felon to serve as president. for felon to serve as president. for now, back to dateline. josh mankiewicz (voiceover): mike dally was living life a free man, raising his and sherri's boys. diana haun was in the slammer, waiting for trial. she and mike spent a lot of time putting pen to paper. "we both know that we are, as all centuries past, destined to be together. your man and cubs are waiting for you to come home." the theme of these letters would seem to be undying love.

prosecutor lela henke-dobroth saw something else-- evidence of mike's control of diana. they were writing letters back and forth and back and forth, very supportive of one another, expressing their love and what they were going to do when diana got out of jail and-- and how they were going to be together. and you will be the mother of my children. and-- and he constantly said things to feed her encouragement to be strong. be strong, di-di. and don't talk. and don't talk. we'll walk out. we'll live happily ever after. josh mankiewicz (voiceover): maybe mike didn't know it, but you probably do. that wasn't going to happen. november 15, 1996. police had spent six months in a deep dive into mike dally's life, and now they had enough for an arrest. i just happened to walk to the front door. and all these police cars, unmarked and regular ones,

came, and they just zoomed right in front of his house. josh mankiewicz (voiceover): mike was arrested for his wife's murder. they went in and brought him out in handcuffs. it looked like they pulled him out of bed. but, i mean, that was a happy day. [laughs] josh mankiewicz (voiceover): it was happiness leavened with worry. larry and debbie weren't confident that mike dally would be convicted. they believed he was a murderer, and they were afraid of him. so after years of living on that perfect little block near the ocean, the english's decided it was time to leave. i couldn't live there anymore. you lived in ventura for how long, debbie? well, i was born and raised there. and you were going to leave your hometown because mike might get acquitted? yes. [suspenseful music] josh mankiewicz (voiceover): august 4, 1997, diana haun's murder trial began. and with that, it appeared mike and diana's undying love

was no more. diana's attorney pointed the finger at mike and then rolled out for the jury a defense that maybe they hadn't heard before. maybe no one had heard it before. yes, diana was blinded by love. and yes, she bought the items used in sherri's abduction. but it wasn't diana in that parking lot. it wasn't diana who killed sherri. diana could never kill anyone because she was a vegetarian. according to the prosecutor, the evidence told a different story-- of an obsessed woman who was into witchcraft and wanted to give her man a human sacrifice-- his own wife. sherri's blood in the car she rented, blonde hair that comes from a wig. lela henke-dobroth: correct. you find the place where she bought a badge and handcuffs. and she doesn't have an alibi for the time of the abduction.

correct. not a plausible one. [laughs] josh mankiewicz (voiceover): remember, diana had said the injuries to her face came from a bicycle crash. at trial, her attorney acknowledged that was a lie, but he did not say what the real story was. the jury deliberated for nearly five days. we, the jury, in the above entitled action, find diana j. haun guilty of willful, deliberate, premeditated murder. josh mankiewicz (voiceover): they convicted diana of murder, kidnapping, and conspiracy, and sentenced her to life without parole. mike dally, diana's lover and perhaps co-conspirator, went on trial, a few months later. josh mankiewicz: proving that michael dally is a terrible husband, a terrible man, terrible in almost every way i can think of-- that's a lot easier than proving that he's guilty of conspiring with diana haun for sherri's murder.

yes, it is. that was a tougher case. and yes, much tougher case. and that's what the defense argued. they said he's a jerk. he was a terrible husband. he did awful things. but that doesn't make him a murderer. josh mankiewicz (voiceover): mike's attorney told the jury this murder was all diana haun's doing. she wanted mike, and that meant getting sherri out of the way. josh mankiewicz: michael dally had set this up so that his fingerprints weren't going to be anywhere on this. he didn't do the abduction. he wasn't in the car, didn't rent the car, wasn't at the scene of wherever sherri was killed, was not present when her body was dumped. he had gotten diana haun to take all the risks. well, his-- his physical fingerprints weren't on it, but clearly, he was conspiring with her and planning with her the whole time. josh mankiewicz (voiceover): the prosecutor said mike's work alibi was one part of a very involved plan.

lela henke-dobroth: he's at work. he's doing his job. he's talking to his co-workers. nothing unusual. and he's clearly not leaving for a period of time. never left the store. clearly there. [tense music] josh mankiewicz (voiceover): if the plan was for mike to be at work while the kidnapping was done by a woman, well, that worked for a while. then the kidnapping galvanized the community. first, the searchers. we're looking at maybe a 40 to 50-mile radius. josh mankiewicz (voiceover): and then a different part of the community. people came forward that maybe you wouldn't think necessarily would want to become involved. josh mankiewicz (voiceover): street criminals made it clear that if mike had a whole second life with diana haun, he had a third life as one of them. he did drugs. he sold drugs, and he hired prostitutes. they came forward? once approached, they came forward and-- and were willing to do this because even they couldn't

abide by what he had done. interesting, ok. and they knew what kind of a personality he was. he was trying to portray that he was something, and he wasn't. well, that's the other thing. i mean, when you're such a terrible guy that you treat your drug dealer and your prostitutes badly, so badly that they are willing to talk to the cops about you-- - exactly. josh mankiewicz: --that's some indication of what kind of person you are. exactly. josh mankiewicz (voiceover): there was one woman in particular who spoke of an evening she spent with mike, while sherri was still missing. michael dally drives to the location overlooking the drop, the ravine where her body is. and he's there with a prostitute and some cocaine he bought. that's correct. josh mankiewicz (voiceover): of course, that woman had no idea sherri's body was so close by. the prosecutor says mike dally had to know. this was him getting some kind of thrill out of having sex and doing drugs right almost on top of his wife's body.

in your face, sherri dally. i know where you are. i did it. and here i am. josh mankiewicz (voiceover): and there was a witness named sally, someone mike had worked with years earlier. mike had started seeing sally on the side, just like diana haun. what's more, sally testified, mike had asked her to kill sherri. and she said michael dally had tried to co-opt me into abducting and murdering his wife when we were boyfriend and girlfriend, and i broke off the relationship. so she's essentially saying i was diana haun before diana haun was diana haun. exactly. she gave us very specific, detailed facts about what michael dally wanted to have done to his wife, how he wanted to have her tortured. he wanted her to feel pain. he wanted her to be stabbed. he wanted her tossed over a cliff so they couldn't find the body. because if you can't find a body, you can't be prosecuted.

how many of those things that sally described ended up happening to sherri dally? every single one of them. josh mankiewicz (voiceover): if the prosecutor was correct. mike dally was a diabolical puppet master, someone who'd found the perfect marionette in diana haun. we wondered what diana would have to say about that. hello, diana? it's josh mankiewicz from "dateline." josh mankiewicz (voiceover): so we asked her. coming up. ok, so wait a minute. you rented the car, you saw the blood in it, but you have no idea how the blood got there. josh mankiewicz (voiceover): diana speaks out. josh mankiewicz (voiceover): and the verdict for mike-- what would that be? when "dateline" continues. icy hot. ice works fast.

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>> stay up to date on the biggest issues of the day with the msnbc daily newsletter. each morning you'll get analysis by experts you trust, video highlights from your favorite shows, previews of our podcasts and documentaries, plus written perspectives from the newsmakers themselves. sign up for msnbc daily at msnbc. daily at msnbc. >> this show daily at msnbc. >> thi[suspenseful music] josh mankiewicz (voiceover): for more than 20 years, diana haun has been in prison for the murder of sherri dally. over all of that time, she has maintained her innocence. why did you kill sherri dally? you didn't? josh mankiewicz (voiceover): diana haun told me she could never kill, and she wouldn't have done it for her boyfriend, mike.

did michael dally ever ask you to kill his wife? and did you ever tell sherri dally? did you ever think about that? did you tell the police? well, they remember. and you did not. josh mankiewicz (voiceover): she admitted she rented the nissan altima and bought props to play cop, but said it was all for a practical joke, not for a murder. at least that's what she says mike told her. who is that in the wig in the rental car? who is it that pretended to arrest sherri dally? josh mankiewicz (voiceover): she says mike or some unnamed co-conspirator picked up the rental car the night before the murder from outside her house and then returned

it late the next day. that's when diana says she saw the stains inside, which she tried to clean up. ok, so wait a minute. so-- so you rented the car, you saw the blood in it, you cleaned the blood out of it, but you have no idea how the blood got there? josh mankiewicz (voiceover): she did not mention that to detectives at the time. what she did talk about was the supportive, loving relationship she had with mike. josh mankiewicz (voiceover): today, diana haun seems to feel a little differently. you feel you should be held responsible for anything here? so felony bad judgment, but not murder? josh mankiewicz (voiceover): now, she says, she thinks mike was setting her up the whole time.

you think it was michael's plan to have you take the fall for this? [suspenseful music] josh mankiewicz (voiceover): the former girlfriend who testified at mike dally's trial. after the jury heard from that ex-girlfriend and everyone else who testified against mike, they took four days to deliberate. when they finally came back, sherri's mother, karylne, was in court. and it was, hold your breath, you know? and then they came in with the guilty verdicts. you're looking at michael when that happened? no. you don't want to see it hit him? i don't care. whatever's going to happen now is going to happen. the thing that i thought was sort of good for sherri was the fact that every time a verdict was read, the people in the hallway that were waiting would cheer. you could hear them. yes. the judge went out and told the bailiff to go

out and tell him to be quiet. the next verdict was read, and they cheered again. you know, they cheered for all of them. josh mankiewicz (voiceover): the prosecution wanted mike sentenced to death. trying to save his own life, he took the stand in the penalty phase to say he had nothing to do with his wife's murder. he didn't participate in it. he didn't want her to do it. that was the theme for the penalty phase. but there were-- you know, there was so much information that we had that we had convicted him on that i got to cross-examine him about all the little details. and i think he did a very poor job. he came across as a sociopath, you know, and not caring, a liar. a murderer. yeah, a murderer. yeah. cold-blooded murderer with no remorse, no regret. josh mankiewicz (voiceover): the jury could not agree on death. so mike dally was sentenced to life in prison

without the chance of parole. even sitting in jail, mike continued to point the finger at diana in this interview with tv station keyt. there's only one person that knows what happened to sherri. interviewer: who? michael dally: that is diane. interviewer: can you describe sherri and diana's relationship? not good. they both hated each other. they both wanted me. josh mankiewicz (voiceover): that hate and that desire seemed born out of mike's manipulation. it's as if he had a personal quest to see which of the women in his life he could treat worse. in the years since, karlyne has cried and prayed over what happened to her only daughter. and somehow, she's come to forgive diana haun. she sees diana as a victim of mike's as well. josh mankiewicz: even though it's diana who abducts your daughter--

yes. josh mankiewicz: --and who kills her in that car-- yes. --and who pretends to be a police officer-- karlyne guess: right. --and puts handcuffs on her-- right. josh mankiewicz: --and dumps her body-- yes. josh mankiewicz: --you've forgiven her? yes. you're a forgiving person. my daughter was put down and manipulated by michael. so was diana. they were both victims of his manipulating and conniving. your forgiveness does not extend to diana haun being let out of prison? no. she needs to stay there for the rest of her life and suffer the consequences. period. michael, i will never forgive. josh mankiewicz (voiceover): and now, in an extra cruel twist of fate, sherri and mike's sons, devon and max, who were raised by mike's parents, do not want to be a part of karlyne's life. devon and max did respond to our requests for interviews.

there aren't too many punishments worse than cutting a grandmother off from her grandchildren. yeah, or burying your daughter. josh mankiewicz: and you've done both. yeah. [sighs] well, you're still here. well, i know god has a plan for me. and maybe it is doing a program like this that maybe some woman will see herself in a domestic violence situation that doesn't show and say, i think i'll get out of this. one woman could see that, this program is worth it. josh mankiewicz (voiceover): karlyne still goes to the spot where sherri was found. there are so many new things. josh mankiewicz (voiceover): so many years later, there's still a memorial. karlyne wishes her daughter had told her more about what was really happening

inside the dally home. i've learned a lot about the difference between emotional and physical domestic violence. doesn't always leave bruises you can see. no. josh mankiewicz (voiceover): karlyne hopes telling her daughter's story will help someone else who's trapped in an emotionally abusive relationship to recognize that danger and to do what sherri dally could not do-- get out alive. [theme music] (luke) homes-dot-com is a new, elevated home-shopping experience. beautiful design, tremendously rich content, and, my favorite touch, it's the only site that always connects you to the listing agent. feels like a work of art! (marci) lovely. what about the app? (luke) uh-oh! look what i did. it's ringing. hello? hello? (marci) they can't hear you.

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