a hunger strike in the middle of the senate, right? let's see if that gets some people to understand how serious this is. >> thank you to both of you for being here on a bryde night. elie mystal, michelle goldberg. that is "all in" for this evening. good evening. >> i'm natalie morales. >> and this is ""dateline." . >> i could not believe it. i couldn't imagine anyone ever wanting to hurt her. i have no idea what could have happened. >> married to her high school sweet heart, family meant everything to her. >> there was a lot of talk about grandchildren. she wanted to have grandchildren, fast. >> it all went up in smoke.

>> we found the remains of julie. >> shock as the blaze was, it was nothing compared to what investigators found in the embers. >> a bullet? >> yes. >> so this woman has been shot to death in. >> yes. >> the obvious suspects. neighborhood thieves. >> there were half a dozen house burglaries unsolved. >> investigators also dug into a favorite theory. the husband did it. >> i was angry. i felt that the detectives were on a manhunt and they were after my dad. >> then up pops a text that might just be a clue. >> you can say maybe she's driving events here? >> that's correct. >> the truth beyond twisting, leaving behind smoking ashes and burning questions. >> i physically started shaking and i started crying. >> i want to know why.

>> welcome to "dateline." julie griffin was a mother and a plays ripped through her home and she was gone was this an accident, a bungled burglary, or something else entirely? here's dennis murphy with "consumed." >> the canterbury hills subdivision in paduca, kentucky, tiny homes by neighbors living ordered lives. as the porch lights winkd out on another day, what happened one cold january night in the wee hours was especially alarming. a roaring, all consuming fire was destroying the homes. >> it was awful, half the house was gone. >> what would rise from those ashes is far more than a fire marshall's investigation into

cause. there will be a crow into the deepest roots of treachery beyond most people's comprehension. >> it's not true. >> what have they all missed in. >> a monster. a liar, a cheater. >> he's destroyed my entire famil family. >> before it became charred rubble the house was home to a long-time paduca couple. keith and the julie griffin. high school sweet hearts, 36 years into a marriage that had produced two sons, erin the older. >> they were very supportive parents. they were loveling. they loved my kids. >> aaron took after his dad, athletic, easy going, levelheaded. younger brother zach was more of a fire cracker, like his mom. there was a time for instance in t

the 6th greg he grabbed a shovel to dig a koi pond. >> they were like, this is going to be a fight mayor. >> reporter: when aaron and zach flew the nest, it seemed their lives became busier, they joined a motorcycle class with their church and were often a four him. >> everybody, the new kid loved the craig guy. >> did he become one of your best friend? >> yes, one of my best friends. >> she had a heart of gold. she'd do anything for you. she also wasn't afraid to tell you how it was either. >> did she get people's feathers ruffled? >> oh, yeah, but everybody loved her. >> keith found a second career as a traveling salesman, which left julie spend a lot of nights ahome in the house.

their own door watched over by their beloved great dane cleo. aaron's wife ali. >> i would leave and go to dinner, the door was unlocked because cleo was the guard dog. >> keith and jewelry were transformed when aaron and ali brought into the world their first daughter ariya. >> when i had that child, it was the greatest day of her life. >> she wanted to be a part of everything she did. >> and julie was there for ali when she went into labor with her second daughter elise. the white knuckle dash to the hospital gave her the name nascar nana. >> she says, don't have a baby if my car. keep your legs crossed, don't have a baby in my car. >> everything seemed to be going great in 2015, keith had weight loss surgery and dropped more than 100 pounds.

julie was over the moon with two granddaughters. also that year came the rift. zach disclosed to his very religious conservative parents that he was gay. >> it was definitely hard. they went from my mom to my best friend and going from talking to her multiple times a day to just being completely, just completely shut off. >> julie visited that fall. they tip toed in the room. the time together gave sam hope. >> was that the step to patching things up with your mom? >> yeah. >> there was definitely a time forward in. >> there was definitely a time forward but we needed more time. >> ten came that call. >> there is a house on fire. >> a deputy drove toward the griffith home. his dash cam recorder catching this glimpse of the blaze, then the fire trucks arrive.

matt carter received a call in the middle of the night. >> it's a bad fire? >> very hot. the house was completely consumed with fire. >> it took about an hour for firefighters to knock down the flames. hours more for them to make their way through the block and wreck annual of the house to what seemed to be the heart of the fire the master bedroom. a gas line is what they would discover. investigators make a pair of discoveries and realize they're dealing with both a tragedy and a mystery. coming up. >> we had recovered a projectile. >> a bullet? >> yes. >> when "dateline" continues. today...

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daybreak revealed the grim aftermath. whisps of smoke rose from the wreck annual that was once the griffith home. detective matt cart er >> this entire structure had crumbled. it was a pile of ashes that was on the ground. we didn't even know if anyone was home or not. we knew that they were in and out of town a lot. . >> >> as firefighters carefully walked through, what appeared to be the fire's epicenter, the master bedroom, their worst fears were confirmed. julie had, in fact, been home that night. >> it was to the right of the box mattresses that we found the remains of julie.

they were unsure initially that it was human remains. we knew that there was -- >> even with all their experience? >> yes. everything was just consumed by fire to the point that things were unrecognizable. >> as for keith, he was away calling on customers in indiana. word of julie's death spread almost as fast as the fire had raced through the house. >> i'm getting ready for work, have the tv on in the background. >> we're live in the canterbury hills subdivision on tudor boulevard. >> then temple bradley's phone rang. it was a friend who also knew julie. >> she said, you know there's a fire. i said, yeah, i saw it on tv. she said, yeah, it was keith and julie's house. and i just sat there. >> did she know at that point that julie, in fact, was gone? >> she knew. so she told me. >> temple's husband immediately tracked down keith as he was making the three-hour drive home from indiana. >> he said, i'm on my way. i'm probably, you know, two

hours away. i said, are you all right? he goes, yeah, yeah. i could tell he was in shock. >> the news hit zach griffith particularly hard. since coming out to his mother, his relationship with her had been strained. and now this. >> i guess you're just beating yourself up something terrible that you had been sideways with her. >> yeah. and i know that if we were just given more time, that we would have been close again. that we would have been, you know, that mom and son duo that we were. but we just -- we didn't have the time. it was ripped away from us. and we never get it back. >> aaron, the elder son, had more of a take-charge reaction. >> got to take care of my brother, i got take care of my dad. >> you've got logistics. before the grief that you can absorb. >> yeah, for me, it's just kind of the way my brain is wired i guess. >> within hours, the griffiths would head from all directions toward what used to be an anchor in their lives, the family home.

>> just gave my dad a big hug and we were both crying. we're like, i can't believe this. you know? what happened? >> keith's good friend craig bradley was there to lend his support. . >> what was the he doing? this was the first time you were able to see him eye to eye? >> i could just tell he was shaken. >> as if the news couldn't get any worth, their great dane cleo along with a second pet daisy had also perished in the flames. craig and keith walked the property, surveying the damages. >> we get to the koi pond. got to get those fish out of there. julie would kill me if something happened to those fish. i was like, you know, let's not worry about that right now. >> overwhelmed by loss, the griffiths were faced with the question, how could this have happened? >> the first thought was that it was the new heating and air unit. it had just gone in. >> the unit had been installed just days before the fire adjacent to the master bedroom. >> that was my very first thought, that somehow the new heating and air unit wasn't put in properly. >> faulty installation? >> yeah.

>> as for the cause of julie's death, that was left to the county coroner's office. deputy coroner ben bradley. what were you working with? >> a very charred body. i could not very well identify it being a person. >> the cause of death seemed obvious. but just to be sure, julie's remains were sent on to the medical examiner for an autopsy. what he discovered was as deeply troubling as it was unexpected. >> he had recovered a projectile in the remains. >> a bullet? >> yes. >> suddenly what was thought to have been death by smoke inhalation was now a homicide. closer examination revealed three bullet holes in all in julie's torso. the deputy coroner immediately called the sheriff's office. >> i said, we need to get some people back to that house because this is going to be a homicide. >> what did you think? wow? >> absolutely. >> lady in a nice neighborhood, good house. >> right. >> now she's got three bullet wounds. >> that's right. on a who-did-it crime.

>> back on 307 tudor boulevard, fire equipment pulled out as sheriff's cruisers pulled in. would the charred wreckage of the home once filled with joy and laughter, now hold clues pointing to a killer? coming up, could julie's this detective spice what could be a critic al clue on someone's phone. >> ping, up comes a text message? >> that's correct. >> when "dateline: extra" continues. aveeno® naturally beautiful results® about the colonial penn program. here to tell you if you're age 50 to 85 and looking to buy life insurance on a fixed budget, remember the three p's. the three p's of life insurance on a fixed budget are price, price, and price. a price you can afford, a price that can't increase,

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>> the theory that julie died by accidental fire had collapsed as suddenly as the griffiths house itself. for detective matt carter, a .45 caliber slug recovered from julie griffith's torso turned the charred rubble into the scene of a homicide. i'm guessing your day changed a whole lot, detective? >> it changed a lot. >> despite more than a decade on the job, the detective had his work cut out for him. no hair fiber, bloody footprints, none of that stuff. >> right. you've got an arson that destroyed any chance of obtaining any of that from the scene. >> for detective carter, the most obvious theory, this homicide was the work of a home intruder. >> a burglary gone bad. >> somebody's looking for the laptop or whatever, jewelry, and thing goes down. >> right. we had had some burglaries within a few miles of this area. >> within weeks or months? >> within weeks. within weeks.

>> as police canvassed the neighborhood for leads and witnesses, the investigator also had to consider the perpetrator may have been someone julie knew. >> you're not ruling anyone out or in. you're simply going through the motions. you're speaking to the immediate family first. working your way out. >> the sheriff's department did not tell the griffiths julie had been murdered. >> we were not told anything by the police at that point. >> but anyone at the scene might have guessed foul play was somehow involved. >> there was just cops all over the property. >> you said, why the cops? >> exactly. yep. >> naturally the first person detective carter interviewed was julie's husband, keith. >> first of all, we are sorry for your loss. >> appreciate that. >> at first, keith talked about what everyone perceived was the cause of the inferno, an accidental fire set off by a new newly installed heating unit. >> you had it installed tuesday? >> it was a whole new system.

>> keith explained the contractor was a friend of his who had done the work just a few days earlier. >> they put a rush on it. i mean, you know, that's kind of what friends do for each other. >> okay. >> and i hope to god that this problem is not his. >> but eventually without giving details, the detective revealed julie's death was no accident. >> the investigation shows that foul play is involved. i do not believe at this point in time that this was any kind of an accident. i want to ask your cooperation on several things. okay? >> okay. >> one of the first things detective carter asked about was how keith and julie were getting along. >> any problems at all that you all had? anything like that whatsoever? >> no, she's my best friend. i mean, i know it. that woman loved everybody. >> the investigator also asked keith for details about his business trip to indiana. >> what hotel? >> comfort suites.

>> comfort suites, okay. didn't leave the hotel? >> i did leave the hotel about -- about 11:00 i went and got something to drink. and i left again about 4:00 and just went and got a doughnut and a coke. like i say, i get up pretty early. >> and what about weapons? did keith own a gun? >> i have a .45 acp in my work truck that i just got. it's never had any -- it's never been loaded. >> as part of standard protocol, the detective asked for keith's clothes. they would be tested for gunshot residue. >> what you're wearing now, is that -- was that fresh clothes from this morning, whenever you >> this is what i wore yesterday. >> before wrapping up the interview, the detective took a look at keith's cell phone. >> while i'm reviewing his phone, i see that he obtains a text message, an incoming text message, from a lady by the name of deanna james. >> ping, up comes a text message? >> that's correct. >> the message read, did you make it home okay?

keith was quick to point out his relationship with deanna was completely platonic. >> she's more like a guy friend. >> no big deal? nothing sexual. >> no big deal. that's right. >> after that, keith was released to go and grieve with his family. detective carter, meanwhile, set out to verify keith's story. >> he had a receipt where he'd stayed. >> so that puts him three hours away from this house fire. >> correct. >> and the death of his wife. >> right. it showed his check-in time and check-out time. >> a quick check of keith's gun showed he was telling the truth about it, as well. the gun looked as though it had never been fired. so maybe he's not the guy? >> he may not be. >> so then, who was? coming up, the detective sits down with deanna. was she really like a guy friend to keith? >> you could say, what, maybe she's driving events here? maybe she wants to get rid of the wife? >> that's correct. >> when "dateline continues.

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. >> hello, i'm dara brown, the possibility of flooding through the south. as it moves east on saturday. the virginia and carolinas expected to four to eight inches of snow and a foot in the mound tapes. today trump will be the tenth sitting president to attend the army-navy game and do the coin toss. he is expected to make an announcement regarding the chiefs of staff. now, back to "dateline." >> julie griffith's family had hardly had time to absorb the horrific news of her death and in a house fire when disturbing rumors started reaching them that investigators thought her death was foul play. the sheriff's department kept details of the murder quiet for days. >> i could not believe it. >> daughter-in-law ali. >> i couldn't imagine anyone would ever want to hurt her. much less set the house on fire.

the dogs perished. i had no idea what could have happened. >> no enemies. i mean, it made no sense. just who would want to kill her. >> after keith was released the night of his interview with detectives, he headed straight to his friends, the bradleys. they were floored to hear the line of questioning that he recounted. what was up with his marriage, his alibi, the gun he owned? >> he had been questioned to the point that he almost felt like they thought he had done this. >> son aaron also got called down to the station that same evening. and he, too, was questioned about his parents' marriage. >> notice anything lately in their relationship as far as any problems or anything like that? that you're aware of anything? >> no. nothing. >> was there any money troubles? was there any relationship, things that we knew of? >> but to a person in the griffiths' circle, the very idea that keith might know something about julie's death was, well, just flat-out crazy.

>> i knew he didn't do it. >> there wasn't any way that keith was involved in this. i remember sitting there, and looking over at keith, just watching him for a while. and finally i just said, you can't even grieve, can you? and he said, no, they've taken it all away. >> the friends' working theory was a botched break-in. they had heard about the neighborhood's recent rash of burglaries. maybe that's what happened to julie. >> they come in, and they startled cleo. >> the dog started to bark. go for them? >> caused julie to wake up and got scared and shot her. >> it made perfect sense. >> but for detective carter, the burglary theory of the crime wasn't panning out. even as they sorted through the rubble, detectives at the scene found untouched valuables, two safes, a cache of guns and julie's purse sitting in plain sight. >> you would think an intruder would have grabbed it. >> you would think so. >> so carter set out to follow

the most promising lead he had. who was this woman deanna, the text messenger, who wondered if keith had made it home okay. he had described her as a guy friend. >> there was just something about that text message that seemed to stick out, and it seemed to create that question of, you know, what's missing here. >> carter had called ahead to the authorities in the indiana town where deanna lived. they'd arranged to bring the woman down to an interview room. she was waiting. >> my name's matt carter. >> deanna was about to tell the detective a story that would dramatically reshape his investigation. >> is she a guy friend? >> no. it was more than that. >> deanna shared the same story with us. >> he wanted me to love him. >> deanna said she and keith first met years earlier at a vendor fair. she was the cfo of an i.t. company, keith the road warrior lawnmower salesman had a booth there. >> keith was sitting there. i guess i caught his attention right away. >> you noticed he was eyeing

you? >> i noticed he was staring at me. so i kind of, you know, just smiled. >> she says he asked her to dinner. they quickly discovered how much they had in common. >> he talked about both his sons and being a grandpa. so i just really connected, because i had grown kids, too. >> after several dates, deanna says, keith expressed interest in a relationship. but she wanted to keep it just friends. they stayed in touch but didn't see each other for a while. then just a few months back, he sent her a flirty text message. >> the text just said, did you cast a spell on me? and i'm like, i looked down at my phone, i'm like, what? he said i was in a party last night and this woman was chatting me up. he goes, and all i could think about was you. >> deanna who was in the throes of a traumatic romantic break-up agreed to start seeing him again for dinners. and she says, he seemed excited to show off the new post-surgery keith. >> he goes, you're not going to recognize me. and he goes, i've lost over 100 pounds. i said, you have?

>> did he look okay? >> he looked fine. i mean, he felt -- i think he was more confident, as well. >> deanna says keith now began aggressively courting her, showering her with gifts, flowers, notes of affection. it was all, she said, a bit much. >> he kept pushing for more. and i kept telling him, you need to back off, you need to slow down because i'm just not there. >> deanna said she couldn't put her finger on it, but there was something about keith that was holding her back. maybe it was the fact that he still seemed unusually bound to a woman he called his ex-wife. from the very beginning, deanna says, keith told her that he was divorced. >> very first conversation. >> i'm a divorced guy. >> right. >> by the time she was sitting across from detective carter in that interview room, deanna says she and keith had never been intimate, but they were dating. and keith was talking long-term. house-hunting for them. >> he said, i don't want to scare you, but i want you to

know that i'm looking for properties here in morrisville to buy, so -- for us to be together. >> for the detective, deanna's story put a whole new spin on the investigation. keith griffith now seemed like a man with a very big secret. or thinking like a homicide detective, was she the one with the secret? >> you can spin it another way and say maybe she's driving events here. maybe she wants to get rid of the wife. >> that's correct. we were open for that being an idea or a possibility. >> in fact, the detective had let her tell her story without ever explaining the reason for his visit. now he laid out his cards. >> was he not divorced? >> no. >> he says, first of all, keith's not divorced. according to him, keith had been married to his high school sweetheart for 36 years. and i just broke down because i -- i couldn't believe it. >> but, of course, there was

more. >> we're conducting an investigation, and this investigation involves what we believe to be a homicide of his wife. >> i was in shock. i felt like, oh, my gosh, i couldn't believe what he just said to me. i had no idea. >> so you believed she had been played by this guy? >> i believe that she had. >> so detective carter wondered if keith griffith had manipulated and lied to this woman, had keith lied to him, too? maybe it was more about what keith hadn't said. rewind to that moment when the detective had dropped what should have been devastating news on keith. >> the investigation has shown that, that foul play is involved. >> okay. >> did he ask you the questions, what happened? what are you telling me here? she was killed? >> no. >> you'd expect that, right? julie was shot by an intruder? what's going on? >> right, there was no questions to that. >> but if keith griffith was somehow involved in his wife's murder, how on earth had he

pulled it off? after all, he was hundreds of miles away at that hotel the night of the crime. unless, of course, he wasn't. coming up, a security video surprise. >> scrolling through the tape. >> going through, going through. >> and then when did your bingo moment come up? >> and then a twist rocks the entire griffith family. >> we were all frantic. we had no idea how it could have happened. >> when "dateline: extra" continues. oh milk. am i willing to pay the price for loving you?

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>> six days after the cold-blooded murder of julie griffith, family and friends gathered at her church to say good-bye. between the visitation and the memorial service, son zach was overwhelmed. >> just showed, like, what an amazing woman that my mom was to have that many people come out just to say that, you know, they just wanted to give their condolences. >> to close friends craig and temple bradley, julie's husband keith was more emotional that day than they'd ever seen him. >> tears, sadness. >> i'd never seen him cry, you know, in my life. >> but even as the griffith family mourned, zach and his brother were feeling uneasy about the investigation which seemed to be focused exclusively on their father. >> i was angry.

i felt that the detectives, the sheriff's department were on a manhunt, and they were after my dad. >> because the husbands always do it? >> yep, the husbands always do it. and they just seemed they zeroed in on him and were going at it 110 miles an hour. and were not respectful to my brother and i about any of the developments or anything going on. >> but detective matt carter had an ongoing investigation, and he felt there was ample reason to pursue their dad. after his interview with deanna, he had driven to the hotel that was keith's alibi. there he uncovered a bombshell. remember keith saying to the detective he had been at the hotel the entire night, ducking out just twice to get a drink and a snack? well, unhappily for keith's alibi, when the detective hit play on the hotel security video, it told a vastly different story. keith is seen leaving as he claimed around 11:00 p.m. but -- >> i think within 15 to 30 minutes he's going to be returning. that never happened. >> you're scrolling through the

tape. >> going through, going through. >> and then when did your bingo moment come up? >> he finally arrived back at the hotel six hours and 34 minutes after he left initially. >> gone for more than 6 1/2 hours. was that enough time for keith to drive all the way back to his house in kentucky, commit the crime, and return? >> so what did you and your partner find when you put a clock to it? >> driving the speed limit to and from, it would have allowed approximately 20 minutes, at least, to have committed the crime. >> is that enough time for him to do this lethal act, kill his wife and torch the house? >> i believe it was ample time. >> 15, 20-minute window? >> yes. >> keith griffith was arrested and charged with arson and murder. >> you care to answer the allegations, sir? >> he could face the death penalty. he pleaded not guilty. >> we were all frantic. we had no idea what was happening, how it could have happened. because at that point we knew that there was no way that he had anything to do with it.

>> this is nightmare country? >> yes. but again, we thought it would all be explained. they would do their job, they would take him, and the truth would come out. >> i was 100% convinced that he was innocent. and they were taking the wrong person in. meanwhile, the person who actually did it was getting away. >> family and friends were for sure distressed to learn that keith had another woman on the road. but the revelation wasn't enough to shake their support for him. >> it was a shock. but it was something that we accepted as a mistake. but that did not mean that he killed julie. >> there's no way he did it. not to julie, his wife. >> yeah. >> kids' mother. no way keith did it. >> but when keith griffith went to trial in february 2015. >> all rise! >> prosecutor raymond mcginty laid out a formidable circumstantial case. >> on january 17th, 2014, keith griffith decided that he could

kill his wife -- >> a cornerstone of the case was that hotel security video. not only did it show keith gone for enough time to commit the crime, the prosecutor said, it also caught him in a lie. remember in his interview, keith told police he hadn't swapped clothes that night? >> -- change clothes? >> no. >> but a look at the security footage showed he had. >> he left wearing one set of clothes. one of his work shirts. he came back dressed in all black. >> the prosecutor also showed security video captured from a residence near the griffith home. it caught a glimpse of an suv pulling into the subdivision shortly before the fire. >> it was a little blurry. it was a few seconds long, but it sure looked like keith griffith's car. >> and another circumstantial bit. who else but keith, the prosecutor said, could have gotten by the griffiths' aggressive great dane cleo? certainly not an unknown intruder. >> the dog and keith were very close. a burglar couldn't have come in. a family member could have.

>> as for the why question, how could keith, a man who by all accounts loved his wife, actually do it? the prosecutor turned to two age-old motives. >> almost every case involving a husband and a wife, it's lust and greed. one or the other. this one had both. >> the lust part of the equation, he said, was deanna. >> raise your right hand. >> she took the stand and told the jury that not only was keith house-hunting for them, he was also making plans to bring her down to paducah for a concert and introduce her to his family. >> i would love for you to come for the weekend, stay for the weekend. we'll go to the concert. and i would really like for you to meet my dad. >> as for the greed part, that was life insurance money. two policies on julie's life worth $250,000. one of them, the prosecutor said, had taken effect just eight days before julie died. >> keith griffith got to the point in his life he just wanted to start something new, and he

didn't want to give julie griffith what she would have needed in a divorce and would have been entitled to. >> keith's daughter-in-law ali griffith, listened to the entirety of the prosecution's case. all she heard were theories. >> they spun a story. and they told a story how they wanted it to go. and they had facts that supported their story. but did not prove it. >> and that's what keith's defense attorney, mark bryant, hammered home for the jury. >> what does no evidence mean? >> they didn't have dna. they didn't have any kind of forensics. they didn't have a confession. they had nothing. they had circumstantial evidence. >> in their haste to arrest keith, the defense argued the police had gotten it wildly wrong. yes, he conceded keith wasn't the husband of the year. but he said deanna's story that keith was pursuing her for a long-term commitment was nonsense. rather -- >> what he wanted was a port in every storm. >> as for the life insurance, $250,000 was far from a financial windfall, he said.

even the bradleys knew that the reason keith and julie bought that new policy was because of a friend's recent tragedy. >> she had been nagging him about getting -- making sure they had plenty of life insurance. >> and he argued the footage of the suv pulling into the subdivision was far too blurry to i.d. it as keith's ford expedition. besides -- >> if a guy is going to go to this much trouble to kill his wife, why would he drive an expedition that everybody knows he has? >> but the big question still remained, if keith hadn't driven back to paducah to kill julie, where had he gone the night of the murder? the only person who could answer that was keith himself. >> he was very adamant about taking the stand. >> he wanted to talk to the jury? >> he did. >> what would he say? and would the jury believe him? it was roll the dice time. coming up, keith's eyebrow-raising alibi. >> i was embarrassed and ashamed of what i was doing the night my wife died.

>> and then what keith revealed to us. >> that's what i've told everybody, when they hear the story, they're not going to believe it. >> why even a jury couldn't end this case. when "dateline" continues. ♪ can you feel it ♪ can you feel it ♪ can you feel it box: woah! ♪ can you feel it woman: delivery ♪ can you feel it woman: alexa, turn on the lights. ♪ can you feel it ♪ can you feel it

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now the accused murderer was insisting on taking the stand in his own defense. and he had a bombshell to reveal. here's dennis murphy with the conclusion of "consumed." >> keith griffith was about to take the stand and explain the most damning piece of evidence against him. hotel security footage put him off the grid for more than 6 1/2 hours the night his wife julie was murdered. but if he wasn't perpetrating the crime during that time, then where was he? >> tell us your name, please, sir. >> keith wayne griffith. >> keith's explanation came with an embarrassing secret. his lawyer argued that ever since becoming a traveling salesman, keith had struggled with an addiction to sex. >> keith, until you got out on the road several years ago, did you have this kind of a sexual addiction? >> no, sir. >> and the night julie was murdered, he said he spent those hours out prowling for women. after he left the hotel, he changed out of work clothes into his "man out looking" duds.

>> i didn't like people to put my job with my carousing. >> with your carousing? >> mm-hmm. >> he said he went to a massage parlor, a bar and couple of strip clubs. but try as he might he never found a hookup. >> i was trying to pick somebody up. wasn't anybody available or interested or whatever, however you want to put it. >> after last call, he said he went down to the river to watch the boats before returning to the hotel to catch some shut-eye. as for why he lied to the police -- >> i was embarrassed and ashamed what i was doing the night my wife died. >> did you kill your wife? >> no, sir, i did not. i loved my wife. >> did you burn the house down, keith? >> no. >> did you kill those dogs? >> no, i loved those dogs. >> when the case went to the jury, keith's friend craig bradley didn't know which way the jury would fall. >> i didn't know if he would get acquitted. but i didn't think he'd get convicted. i mean, i really felt like it would be a hung jury. >> turns out he was right. after six hours of deliberation,

the jury was deadlocked. >> i'm going to declare a mistrial at this time. >> keith would sit in jail for another year as he awaited a second trial. a long time for his family to process the story he told on the stand. >> he left to go to a bar, to go cruising, or something? and then he goes and sits on the riverfront? like, he has never done that before in his entire life. >> so when he stepped down, you thought? your father did this? >> yeah. yeah. i mean, i definitely wasn't saying it out loud. and i wasn't ready to accept it. but i definitely was moving in the direction of the only thing that makes sense at this point is that he committed the crime. >> after months of wrestling with his thoughts, zach decided it was time to send his dad a letter. >> i put in the letter, my opinion was you did it. you know, you took away the last chance that i had of rebuilding a relationship with my mom. you're no longer allowed to contact me. and i don't want you to ask about me to anyone. >> wow. dear dad, you are dead to me. >> exactly.

>> his brother's wife, ali, had started to feel that way about keith, too. >> it seemed like he was fabricating everything that came out of his mouth. >> but there was a split in the family. despite doubts of his own, her husband aaron, the one closest to his father, was still a supporter. >> whatever issues my mom and dad would have had, i just could not believe that my dad would take my kids away from their nana. >> then a few months before keith's retrial, detective carter's phone rang. there was news from the jail. an inmate had some information about keith. and it was as eerie as it was chilling. the detective in the bull's-eye. >> keith had come forward to him wanting to have me killed. >> put a hit on you? >> put a hit on me. >> orchestrating your death? >> yes. he'd drawn a map of what he believed to be my residence. suggested the caliber of weapon to use to kill me. the informant specifically asked him what if my family was present, and his response was

one word, and that was tragedy. >> wow. that does make the hair on your neck stand up. >> it does. >> that wouldn't look good to a jury. the development brought aaron to a tipping point. were you no longer wavering at this point, aaron? had you come down on the side of, oh my god, my father killed my mother? >> yeah. yeah. >> now aaron, too, wrote his dad a letter. if he was guilty -- >> it's time. it's time to man up and do what you should have done two years ago. >> keith's defense attorneys went to the prosecutor to hammer out a plea deal. they agreed on 30 years in prison for the murder and for soliciting the hit. moments later, keith was standing in a paducah courtroom speaking the words his family and friends never in a million years thought they'd hear him say. yes, he murdered julie. >> there's no excuse for what i did. and i can't take it back. and she was my best friend. and i don't know what happened to me.

but i did it. there's nothing i can do about it. >> temple bradley who works near the courthouse was there. >> my heart was breaking. that the person that i have -- that wholeheartedly i put my trust in for two years had lied to my face. >> i just can't believe we've been deceived in that way. because we were there for him the whole time. >> for keith's family and friends, there are so many questions. but one seems to tower above all the others. >> i want to know why. and i want to know how you go from a loving husband and father and grandfather to driving all that way, killing your wife, then covering it up, and then lying to your family for so long? knowing that we had everybody doubting us, that we still defended him. disgusting. he's a monster.

>> all i can tell you is that i had a lot of bad thoughts, wrong thoughts, mistakes. >> we sat down with keith hoping for answers. but as many times as we asked him why this all happened -- >> why did you do it? >> i really can't tell you. i don't know. i mean, just a bad decision. >> we never did get a satisfying response. >> so this isn't some kind of delayed midlife crisis here? >> no. >> where you're trying to be with deanna or someone like her to have a final happy chapter in your life? >> no. >> new house -- >> julie and i were happy. >> you see how perplexing it is to hear this. >> i know. >> it's absolutely confounding. >> that's what i told everybody when they hear the story, they're not going to believe it. i have a hard time believing i did what i did. >> one thing he didn't do -- >> how about a divorce? >> never crossed my mind. >> keith now says the remorse began the moment he pulled out of his driveway. >> trying to get out of the subdivision, crying before i ever get out.

regretting what i'd done. i probably drove 100 miles an hour all the way back, hoping to get caught. >> as for the future, keith says he is prepared to die in prison. >> i don't have anything to live for. except maybe forgiveness. >> from who? >> from my boys. >> that's why you're talking to me today? >> exactly. yes. >> well, it's between you and them. i'll tell you, my take on it is you've got some distance to make up. >> i know i do. i've got a lot to make up. >> of the countless things keith stole from his family, resilience was not among them. aaron and zach are closer than they've been in years. and now that they know what happened to their mother, they say they can finally mourn her passing. and focus on keeping her spirit alive for those two little granddaughters who were the center of her universe. >> my oldest daughter will remember. like i said, she talks about her

almost every day. we have pictures of her up in her room. as my youngest gets older, we'll tell her the nascar nana story about when she was born. just never let her memory die. >> that's all for this edition of ""dateline"." i'm craig melvin. thank you for watching. i'm craig melvin. >> i'm natalie morales. >> and this is ""dateline"." . we all wanted to believe it was an accident. there is no possible way he can do this on purpose. >> a dark house, a husband with a gun. a wife dead on the floor. >> make sure that she is still breathing. >> oh, i don't think she is, dam it. >> there was no question who