the all new episode of leguizamo does america start right now on msnbc, it is also streaming on peacock thank you for making time fo us and make sure to catch us saturdays at eight sundays a nine right here on msnbc follow us on twitter tikto instagram. until we meet again, i'm ayman mohyeldin. -- hello, i'm craig melvin an this is dateline >> what she saw was

nightmare. she screamed and she yelled an she cried, it was terrible did she fell down the steps? no one was thinking someone di this to her, but did someone d this to her. it just unraveled from tha moment on. >> the fashionista with re lipstick she meant the world to me. when she walked into the roo it was like a movie star walke in >> corporate executive, caring mom, 1 million dollar smile an a 4 million dollar estate. >> oh my god, i need a ambulance. >> murdered. >> i went screaming out of the house. >> this was a prominent woman, murdered in her home, late a night. >> almost certainly someone sh knew >> correct >> where would it lead a twisted case of betrayal and greed. >> the fingers being pointed a me >> her own daughter of suspect from the start >> you pulled the knife out an you tell the police oh you are going to find my fingerprint

on the knife >> her son in law who seemed s devoted. >> they interrogated us fo eight hours. >> or maybe someone else with million dollar motive. >> what's going on here? how many people are involved i this got >> someone doesn't jus turned into a murderer ottawa >> hello, and welcome to dateline she was a smart loving wealthy widow in the suburbs of ne york city. and, an unlikely target fo such a brutal murder >> police immediately zeroed in on the most likely suspect but solvin this crime would not be easy o quick. >> >> here's josh mankiewicz with the evil to come >> it was hard to look awa when peggy was in the picture. her beauty was captivating

but she was also spark and ambitious. and she loved that little girl >> her image survives and home movies and in memory from th days where she was relishing life, blissfully unaware of th evil to come >> i was always close with m mother, always >> i suzanne said her mom pegg was everything a mother coul be >> as a child i skated m mother would sit in the rink and freeze, sit there with coat on all bundled up and shivering. >> suzanne and her younger brother jim grew up in suburba rockland county about 45 minutes north of new york city >> we were able to go to sleep away camp when we were little, my parents traveled. >> at first, peggy did wha 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 from he suburbansanctuary. , her mom was back in school earning her mba when suzanne was young. >> she was probably one of the few women in the graduatin class. >> it was a man's business and worked very hard >> much like the fictional character peggy olson in the hit series mad men the real life peggy broke th glass ceiling at xerox and became a rare member of th executive boys club. and martin was in that club, to >> we didn't have too many female managers, and peggy, sh rose very quickly because sh was very intelligent >> and always well dressed >> peggy wore a lot of black she loved to dress with th latest fashions. >> unlike her fashionable mom, suzanne was a blue jeans and t-shirt kind of girl

>> susan, how do you explain suzanne? she's quirky, she's outgoing she's athletic >> darcy greenberg is one of suzanne's best friends >> she spontaneous, she' talkative, she also likes to b close to home. >> after college, she came bac to rockland county and went to work at xerox, herself one night, in a bar, suzanne then 21, fell for, actuall fell over, a 17 year old rac car driver named bobby's castillo >> she actually stepped on me, i wound up sleeping on the floor, she's picking me up and we saw each other and starte talking. >> three teen years later, suzanne and bobby who was by then a welder and steam fitter 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 an treasuring her family. her son jim was now psychologist living in florida with his wife diana, and their two children >> i get the sense that jim wa not as close to your parents a you were >> i will agree to that. >> and why would that be >> maybe because of th distance that he was so fa away he did call, he did speak to them, but my brother is my brother, he kind of lived in his own world. >> but suzanne and her mom wer very much in the same world. >> how often did you see you mother >> almost every day. >> suzanne, always on the road for her work as a marketer for a hospital would often drop in on her mom when she wasn't visiting, she' be calling >> i speak to her in the afternoon, in the evening, mak sure she was home. >>

it's almost like you are sor of the pair and she was th kid. you were checking up on her. >> oh absolutely >> life was good for the famil until one morning in january 2014 suzanne went to check on her mother >> oh my god, oh my god, oh my god, i need an ambulance right away >> and everything changed. >> coming up, -- >> i was screaming >> suzanne is in the drivewa looking rather frazzled. >> the first thought was, oh m god, she tripped and must of hit her head >> no way that she fell down the stairs >> when dateline continues laritin-d knocks out your worst allergy symptoms including nasal congestion, without knocking you out. feel the clarity and make today the most wonderful time of the year. claritin-d. ha-ha! it was me the whole time. -whoo-hoo! -[ laughs ] well done, ma'am.

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started off cold and snowy suzanne says her day started off as it nearly always did. calling her mother peggy >> i called the cell, sh didn't answer, i called th house, she didn't answer i said, all right, maybe she's in the bathroom or she went ou to the garage for something. >> suzanne, who lives in a suburb of new york city called diana, her sister in law, in florida. >> i said, have you spoken wit mommy this morning, she said i called her at 7:30 and i haven't heard back from her. >> now worried, suzanne got in her car and drove to peggy's house. >> as i'm driving him callin the house, the cell, the house the cell, no answer. now i'm panicking. i pulled into her driveway and

i saw the roof of her ca through the garage door. and i said, oh, this is no going to be good >> she was right suzanne says she found peggy crumbled at the bottom of th stairs with a knife in her chest. >> the first thought was, oh m god, she tripped on the cat an fell and stuck herself >> then, she says, she saw the blood. i said, oh my god, she mus have hit her head when she fell >> and then, suzanne did something that would later raise a number of questions. i pulled the knife, i was goin to do cpr. >> you pulled the knife out of her? >> if your mother was laying there with something stickin out of her that was hurting her, but would you do you would want to make tha hurt go away >> could you tell that she was no longer alive? >> when i touched her neck, sh was kind of cold >> suzanne ran out of the hous and called 9-1-1 >> oh my god, oh my god, oh my god. >> i was screaming

i'm sure the neighbors tha were around heard it >> i need an ambulance right away >> ma'am, calm down, what' going on there >> my mother fell down the stairs >> suzanne was right about one thing. peggy was dead her next call was to her brother jim in florida i >> echo my brother's house he didn't answer, i call diana i said mommy's gone, she started screaming at the other end of the phone what do you mean, she's gone i mean she's gone, she died, something happened, she died >> detective stephen col hatcher and earl lawrence were on the scene they noticed that suzann looked a wreck standing in front of the house in the snow >> suzanne is at the foot of the driveway pacing lookin rather frazzled. >> she told detectives what sh told the 9-1-1 operator that peggy tripped over the planet. >> her mother must have tumble

down the stairs and stabbe herself with the knife >> what detective cole had t stay outside with suzanne, detective lawrence went inside the house. this is police video of th scene taking that morning. >> lawrence knew right away, this was no accident. >> no way did she fall down th stairs and trip over a cat >> detective lawrence saw that peggy had been strangled and then stepped it also looked that she ha been beaten with the statue ha under her body the gold medal ball near her hand >> the crime scene itself wa very concentrated, everythin is at the bottom of the stairs and in the bedroom upstairs. >> something else caught the detectives attention, tw chairs were pulled out of th kitchen table as if peggy ha been sitting and talking wit someone. peggy's computer, while it, an jewelry were missing a jewelry box lay near a chair

and living room empty. but to earl lawrence, th burglary looked phony, staged. >> the bedroom drawers, they were neatly pulled out neatl placed on the floor in front o the dresser. a normal burglary scene, stuff is everywhere. >> people go through it like a tornado. >> correct >> and this wasn't a break and enter job. police could tell that whe they look at the fresh sno outside the house. >> there was one set of th footprints and that was th responding officer choking the perimeter of the home. >> nothing suggesting that someone had walked around or case to the place? >> not a thing >> the front door hadn't bee jimmied or broken in >> the key in the dead bolt in the front door that is require to open the door from th inside, that was in the look >> meaning peggy had unlocke it from inside >> correct >> that afternoon, detective brought suzanne and her husban bobby to the police station an started asking questions >> suzanne told them

contractors had been doing wor 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 an effort writing down all th people who worked on the house >> absolutely. >> any of that go anywhere >> dozens of people, not a thing. >> who would want to pick, who would want to kill peggy, an why? got >> assistant d eight richard moran thought he had a answer for that second question >> financially she was i pretty good shape. >> very good shape >> peggy and her late husban had built quite a large nest egg. >> the estate ended up being worth about $4 million >> you've probably seen people killed for a lot less. >> a lot less. >> and who would stand t benefit? >> coming up >> i felt very early on that i was most likely a family member >> a closer look at suzanne. >> you pulled a knife out, and

you tell the police, right away, you're going to find m fingerprints on the knife. >> a few million motives for murder >> my mother is worth high seven figures, this is not the way i wanted to get my money that is the exact words sh used >> when dateline continues ji (vo) get internet that keeps your business ready for anything. from verizon. detect this: living with hiv, i learned i can stay undetectable with fewer medicines. that's why i switched to dovato. dovato is for some adults who are starting hiv-1 treatment or replacing their current hiv-1 regimen. detect this: no other complete hiv pill uses fewer medicines to help keep you undetectable than dovato. detect this: most hiv pills contain 3 or 4 medicines. dovato is as effective with just 2. research shows people who take hiv treatment as prescribed and get to and stay undetectable

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and earl lawrence said the tea from the crime lab had shake peggy's house to its foundatio looking for a lead >> forensically, you guys go almost nothing off the scene >> not almost nothing, nothing >> no fingerprints >> no fingerprints >> no dna. >> no dna. >> no blood, no hair, nothing. >> but the scene did tell them something. >> i felt very early on that i was most likely a female, or two females. >> what pointed to being women >> the fact that there was seven or eight lacerations o peggy's skull from the statu head >> that statue is heavy, and effective weapon in strong hands. >> my nonmedical pinion wa that if she was hit in the hit that statute by a man her head would have caved in. >> a man would have been abl to swing the statue harder >> one or two times at the most >> and all of that pointed

straight to peggy's daughter suzanne. not only did suzanne stand t inherit half of her mother's 4 million dollar estate. detectives thought her behavio was suspicious from the moment they arrived on the scene. >> she's saying, m fingerprints are all over th knife, my dna is all over th house. >> and she was telling detectives the same thing sh said during the 9-1-1 call, bu it was an accident >> i think my mother fell down the stairs - >> in the 9-1-1 call, you ar offering a theory of wha happened that's very unusual. >> i thought she fell. >> secondly, you pull the knif out and you tell the polic right away, so you are going t find my fingerprints on th knife. which, sounds like somebody wh is thinking ahead to the fac that knife is going to get dusted for fingerprints. >> sure. >> we do not agree that all of that is pretty suspicious when taken together >> maybe to them, it wasn't to me

obviously they formed an opinion from the get-go. >> detectives thought this was odd as well. >> she said, listen, maybe thi was a burglary, check for laptop, large ring, an jewelry. a cold earl, i said early, check for those three things he can be back and said, hey there's a pretty much the only three things missing >> then, again, in those first few moments, suzanne started talking about peggy's money. >> one of the one of the thing she yelled that was my mother' worth high seven figures >> this is not the way i wante to get my money. that's the exact word she used >> she wants to talk her way right into suspicion >> absolutely. >> at one point you said thi is, not how i wanted to get my money? >> i don't recall saying that. but if they have that on recor -- >> but you believe me that tha is what you told police. >> yeah. >> because, again, you are

answering a question polic haven't even asked yet >> i guess i watched too man of those dateline shows in the middle of the night. >> detectives had alread talked with suzanne and he husband bobby on the day of th murder, questioning them for hours. >> you wouldn't worry about? >> no, not at all. pay for this thing for my mind is that i would be a suspect o my wife would be a suspect >> police were feeling differently. as their scrutiny intensified, bobby and susan decided to hir an attorney and stopped talkin to police. assistant district attorne richard morant said that slowe everything down. >> best way to get information about the investigation woul be through her when she stopped talking to us things take a lot longer >> there was a point at whic you and your wife stoppe cooperating with police, and hired an attorney. >> we didn't stop cooperatin with the police came

that's what they want you to believe. anything they wanted to know all they had to do was ask m attorney >> your wife felt the same way about that >> absolutely. she was scared they were going to try and pin it on her >> once again, suzanne was right. >> we had, we believed probable cause to arrest suzanne. we just couldn't do it because something was wrong. >> what's wrong? everything points in her >> it's an easy way out to d that too early >> hey it's a ground ball. >> this wasn't a ground ball >> this would be no easy out detectives would be going into extra innings. , >> coming up, the two fina phone calls of peggy nadeau' wife, life one was on a secret phone. >> these are phones used b drug dealers, killers, cheatin spouses. >> that's right. >> could that color be the killer

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i'm frances rivera, here's what's happening biden confirms u.s. personne have been evacuated from khartoum biden also called for cease-fire in the africa nations conflict that is lef at least 427 people dead, so far. police in jasper county, texas are investigating after nine people were injured in a shooting at a post propam rty. officials say the injured di not suffer life-threatenin wounds bu >> the four days after peggy nadler's murder, family an friends gathered for her funeral. for peggy's daughter suzanne it was all a blur. >> what's it like to process both the fact that your mom wa actually murdered and that you were the suspect

>> it was horrible, horrible i lost my mother, i lost m best friend, and now the fingers being pointed at me. hey >> as 80 year old pegg nadal was laid to rest today her daughter suzanne has hired a lawyer >> people in the area, it's al they talked about. >> suzanne's friend darc greenberg was hearing it almos every day. >> there were people who sai 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 >> this is someone tha probably knew her since she wa a child. >> darcy was convinced suzanne loved her mother and would never have heard her >> she was grieving. she was crying every day she could barely get out o bed. she couldn't sleep at night. >> peggy needles murder was no the biggest case ever to hit the clerks town police department >> we had the hole detective bureau on this and some othe agencies and have never seen them work harder on anything i

my life. >> perhaps because polic couldn't talk with susan they stayed very close to he and her husband bobby. and very visible >> they parked outside my hous and set. when i left, they left when i came home, they cam home go >> did you think police wer going to come get? >> yes, i did. i was saddened i was scare when >> police even looked int suzanne's shopping habits an found something that intrigued them suzanne bought her groceries a a nearby shop right, a big supermarket chain. in fact, she was a creature of habit. visiting their 22 times in the month prior to peggy's murder. but on the 23rd time, the nigh before peggy's murder, suzanne shopped at a different story the one near her mother' house. >> what did she by >> she bought cleaning supplies,

rubber gloves, and some othe items. >> had the crime scene bee cleaned up detectives didn't think so but still found it suspicious. >> just before your mother was murdered you go to the sho right, not the one near your house, the one near your mother's house, and you bu rubber gloves and cleaning supplies >> i did i mean, i buy cleaning supplie all the time i have a cleaning girl, sh probably needed rubber gloves, she probably needed floo cleaner. it's interesting, they kne what i bought. >> and detectives wanted t know about who peggy might hav had contact with in the hour before her murder. so they made this list o numbers they found on peggy' home phone as they look at them, one stoo out. it was a call from an odd area code, and it came in at 1:17 i the morning. >> that was from what turned out to be a track phone. they are commonly referred t as burner phones >> these are the funds used by drug dealers, killers, cheatin

spouses. after tha track phone call, the alarm at peggy's front door was tripped and that 1:23 a.m., the alar company called get >> hello, this is th monitoring center, gus >>'s pegging adele, th colbert's max, i'm sorry >> that's okay, ma'am. >> and that everything is okay have a good night. >> it was probably the las time peggy's voice was heard b anyone except for killer police were convinced, still are convinced, peggy was letting in someone she knew. suzanne? maybe. but why would you use a trac phone to get her mom to open the door in the middle of th night. >> she wouldn't have to let me in i have a key and i know how to work the alarm. >> so if you wanted to kill her, you could've just waited til she went to sleep, unlike th

door,. >> and when in there you go >> police had warrants for all the family members phones. a few weeks later, they ha boxes of records to come through. detectives analyzed suzanne' first. >> what could you tell about suzanne from her cell phon records. >> a lot >> investigator robin area from the westchester count d.a.'s office specializes in phone data analysis. >> i figure out a pattern of suzanne's life just based on her records. >> and on the day of peggy's murder,. that day was like >> that they would like every other day and suzanne's life there wasn't a change for that particular day >> and you'd expect to see a change if someone is in th process of committing murder for the first time >> correct >> suggesting, she's innocent? >> either that she's innocen or she has another phone but there certainly wasn't communication indicating tha something was going to happen.

>> as hot as detectives were o suzanne's trail, they had neve stopped looking at the other members of peggy's immediate family >> you talk to peggy son jim and his wife diana right after the murder >> yes, when it came up. they lit >> they lived i florida, correct >> yes >> were they in florida at the time of the murder >> jim was in florida, dance that she was in d.c. >> what we see in d.c. >> she said there was a family wedding. >> and the records back that up >> when robin areas looked a jim's cell phone it never left florida. dana's phone records checked out, to. >> where was diana's phone a that time? >> in d.c. >> that's it, didn't move? >> the phone went to d.c., wen back to florida. get >> reasonable to assum that diana never left d.c. >> absolutely. >> you are smiling >> get the pattern was just off, there was just a break >> diana's records wer speaking to areas.

detectives were about to get a break that would shift the direction of the entir investigation. let's just say, this case wa about to go south. >> that secret burner phone, who bought it? who used to? get ready for a whole ne circle of suspects >> coming up >> so what's going on here how many people are involved i this >> that's the question of th day. >> when dateline continues ge two pills relieve allergy headache pain? and the congestion that causes it! flonase headache and allergy relief. psst! psst! all good! ♪ crunchy ♪ ♪ tasty ♪ ♪ sweet or savory ♪

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nadeau's murder had been looking at her daughter suzanne. but now they were also looking at peggy's daughter-in-law diana. >> dana and peggy son jim ha been married for 17 years. and while he may not have been that close to his mother, dian was always on the phone. >> my sister in law used t call every morning my mother would be on the phon with me and say, i gotta go, diana's calling i gotta go >> then it was a stay at hom mom with two kids. picky doted on her grandchildren and would fl them up to new york to spend summers and holidays detectives had already confirmed that diana's cel phone had been in washington d.c. at the time of the murder but when phone analyst robin

areas looked more closely at diana's calling pattern, something seemed off >> when she was in d.c. he activity was just all over the place. kind of the frenetic feel, there was definitely something going on >> now, areas looked at wh diana was calling. putting names and faces to the numbers on her phone she noticed diana suddenly seemed to have a lot new friends in washington d.c. >> a lot of people just popped up in diana's life for a ver brief moment >> areas close them frequent users. people diana was calling repeatedly what was also interesting to m about these frequent users was that they just had suc different lives. >> dan it was a suburban mom and some of these people, well >> a lot of them had crimina histories. living in d.c. remember, dana had been in d.c for a wedding. maybe these people were, you

know, those friends of the groom you have to invite s detectives got the guest list. >> and of the high frequency killers were at the wedding. >> when areas look at diana' phone records on the night o the murder, friday night int saturday morning >> the time of the homicid there was very little activity on her phone, but you really quiet guy >> what did that mean? dana's phone had been in d.c.. so detectives went back to tha track phone that had calle peggy's house moments before her murder the fine of the phone you ca buy for cash, activate fro almost anywhere, and then dump when you're done >> a lot of times, that's dead end, a lot of times >> not this time >> not this time >> to figure it out, detective began by using the track phone number to find where the phone had been sold. >> and what was it purchased >> family dollar store in miam

florida. >> miami >> about two miles from diana' home >> detectives contacted th family dollar chain and go very lucky family dollar was able to give them security video of someone buying a track phone on januar 23rd, just two days before peggy was murdered >> as diana on the tape? >> it doesn't appear so. >> so end of the road? >> now pay >> no, because the woman buying the phone with someon detectives recognized. >> not diana >> definitely not diana, karen and samuel >> karen ham was already somebody get who had profile as a partner who came up frequently on diana's call records. she was a high frequency color >> you've got a friend o diana's buying the disposabl phone that cold peggy just before she was killed. >> yes

it was a big moment. >> now, they knew who ha bought a phone the next step was to figure ou who turned the track phone on. track funds need to be activated using another phon to call an 800 number. after three weeks, detective colin hatchet finally persuade a track phone manager to giv him this piece of paper. >> he had circled the phon number, it was the number that called to activate that trac phone. >> whose number was that >> andrea benson >> had that name surface before >> yes, absolutely all over diana's phone records >> she was one of those people that popped into diane is like one day and it was in d.c. and, benson head a rap sheet >> so what is going on here? how many people are involved i this >> that's the question of th day. >> the other big question, wha did diana nagel do well she wa in washington d.c. >> detectives started with her

arrival at reagan national airport, 9:30 friday morning the day before peggy was murdered >> we got the video from the airport to follow her throug the airport and then follow he outside to where she got into car. >> here's video diana bein picked up curbside >> who picks her up? >> andrea benson >> how do you know it's andrea benson >> it's her car registered t her. >> are you going to licens plate those cameras. >> detectives obtained dat dumps from cell phone towers i washington d.c.. >> that allowed them to matc the travel of the cell phones. >> can you follow diana's cell phone? >> it bounced all around washington d.c. simultaneously with andrea's, they were together day-to-day. >> by late friday, the night peggy was murdered, dana's phone stopped moving and wen quiet. but andrea's phone

>> we saw andrea's phone hea headed out of the washington area and head up i-95. >> exactly the way you would drive you are heading fo peggy's house. >> exactly >> along the way, the trac foam was activated, and it won 17 a emmitt painted a cell tower right near peggy's house what was going on? was this murder for hire did andrea benson drive up t new york, call peggy on th track phone, somehow get int her house and then murder? this is nda moran didn't think so peggy would never have let a stranger like andrea benso into her house >> that had to be a friendly voice on the phone >> yes >> detectives thought that voice might have belonged to diana. but they had nothing to put he on the scene in peggy's house. >> and this one, is suzanne of the block? >> dana is now the highe

suspect. suzanne wasn't off the hook. >> they could be in this together >> correct >> because they both benefit >> absolutely. >> now eight weeks into th investigation, detectives stil didn't know who would kill peggy nadeau with suspects in florida, d.c. and new york, detectives cam up with a new strategy and their phone expert liked i a lot. >> gutsy, a lot of people ar saying don't go to those lengths on a homicide case, thought it was a brilliant strategy >> but would it solve the case >> coming up >> did you have anything to do with your mother's murder? >> the daughter, or th daughter-in-law. hey >> yo my mother in law, is that what you're telling me? >> was one of them the killer? >> oh, god, her eyes wer probably as big as the headlights and a volkswage beetle >> when dateline continues while other allergy sprays take hours.

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craig melvin from the first day peggy nadea was found murdered, police suspected her daughter now, another relatives alibi was unraveling authorities wonder, was th daughter responsible or the daughter-in-law or maybe both. here with the conclusion of th evil to come is josh mankiewicz >> three months after th murder of her mother, suzann nadler was still saying she wa

innocent and she couldn' believe she was ever a suspect >> you watch dateline? >> all the time. >> sometimes, as you kno people look guilty but they ar 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. >> deep into the investigation of peggy nadler yeah the prime suspect was no longer he daughter susan it was her daughter-in-law diana. detectives knew that diana's friend had bought the trac phone they called peggy's hous just before she was murdered diana had told police from the beginning that she had been in washington d.c. to attend wedding. but her alibi was wobbly dana couldn't account for he time in d.c. >> she hit washington and abou 9:30 and didn't reappear again until about 9:00 the next day.

>> so detectives called dian asking her to fill in the gaps >> i just have to confirm that you are up in washington - >> what do you mean? >> we just want to get you cleared. would you spent, where did you spend the night? >> 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 multipl calls to people she knew i d.c. she tried to find somewhere, anyone, who would say they wer with her in washington at th time of peggy's murder >> was she ever successful enough to find somebody to say yes, i will say, diana that yo were with me >> yes she did it was her third attempt >> detectives heard diana tell a female friend to say tha diana had been at her house in d.c. but the woman seemed confused.

>> so it was not in the morning, or was not at night right. >> great, exactly. >> which one nine and 90 -- >> nine in the morning, night. >> organized crime >> not the most intelligen people involved. >> sure enough, when detective called diana's friend, here' what she said. >> to diana stay overnight wit you. >> of course, detectives already knew the woman was lying and that diana was tryin 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 wh bought that track phone, carrying him samuel. they brought karen into miam police headquarters fo questioning. -- karen admitted she bought that track phone for diana. then they asked her if diana had said anything about pickin a deal's murder.

her answer blew them away. >> she did say that she wa there at the mother-in-law's >> did she tell you who stabbe her? >> no. >> prosecutor richard moran wa there, listening in anothe room >> that's the first time w have firsthand information tha diana was in the house before long, diana was in that same miami interrogation roo where she recognized som familiar faces she probabl wasn't pleased to see. -- john >> and she knew why they wer there. >> yes, it was, and after five months the investigation was about to end >> you are under arrest for th murder of peggy nadeau - >> that same day, another team arrested benson in d.c..

detectives lawrence and cole hatcher were confident they ha the right people in custody. and suzanne was finally off th hook she heard the news fro relatives. >> they said they arrested diana for my mother's murder and that there were othe people involved in it. i was shocked. >> what did she look like. >> her eyes were probably is because the headlights and volkswagen beetle. her instant reaction was, knew it, i knew it >> suzanne says her mom ha been sending money to dian regularly to pay for hom repairs and expenses for the kids but she says diana wanted more >> she wanted to live my mother's life, do all th things she couldn't afford t do >> and to do that all she ha to do was unless the help of a few friends didn't commit murder >> detectives did not think ji knew anything about his wife's deadly plan for his mother and what exactly was your plan they and i had stopped talking

and asked for a lawyer but her friend andrea benson kept talking and told d.a. richard brand the whole story. andrea said she had never me diana before, and had been tol by a relative to pick diana up at the airport and as they wer driving. >> dana del said to her, i'm not really here to go to a wedding, i'm really here t kill my mother-in-law. >> she says this to a person she's never met before >> yes >> and andrea benz and says, okay, i'm in >> for $10,000 >> and right there the deer is done in that car >> the plan starts takin shape. >> benson said she drove the four hours up to peggy's house and then diana used that track phone to call he mother-in-law. >> dana tell us her, i'm here, don't you miss me, i want to come see you >> at 1:30 in the morning. and thank you letter in. >> good benson said she went i

with diana, they were wearin hair nets and gloves to keep from leaving evidence. diana and peggy sat across fro 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 benso started choking her. >> andrea said peggy was still alive when diana hit her mother-in-law with a metal bal and beat her with that statu head >> andrea benson's words were, she wouldn't die at that point, according t andrea benson, diana went into the kitchen, got a knife, came over and started stabbing peggy. go >> andrea benson pleade guilty to second degree murder the sentence was 20 to life. >> i need you to know just how sorry i am >> the woman who bought th track phone, karen handstand

you'll, was never charged with anything dana, apparently not content t wait in jail for trial was caught on tape trying to arrange for hitmen to try an kill karen in miami. -- after that, dana also pleade guilty to first-degree murder. dana did not respond to ou request for an interview she did speak on the day she received the sentence of 2 years to life. >> i would like to say that am very sorry for my actions and then i am extremely sorr for any pain i may have caused especially to my husband >> suzanne was there a sentencing >> you took away a wonderful mother and grandmother i hope you stay in prison --

enjoy prison >> i mother's day, suzanne and bobby went to visit peggy' grave. >> hey, mama >> finally, it was all over. get >> you kind of look at lif a little bit differently life is very valuable. >> it puts things in perspective. >> you've done anything specia 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 goin to be so soon. that's all for this edition of dateline, i'm craig melvin thank you for watching