and every time we have class, she's dancing. that's all for this edition of "dateline extra." thanks for watching. it was tough. it was tough to think that anybody could do that to someone. to look at the pictures of what they did to her and hear details of how it was carried out, it's just, it's devastating. >> reporter: shauna tiaffay, loving mom by day, vegas cocktail waitress by night. >> i was at one of the bars and i saw her walk by. every single head turned. >> it was after her shift that they found her, the victim of a ruthless attack. >> i mean, your heart just drops to your stomach.

>> reporter: potential suspects? how about a casino's worth of customers? >> shauna was very beautiful. >> we didn't know if there was some psycho was watching us girls working at the palms. >> reporter: or, did the answers lie in the dead woman's past? >> shauna started thinking, i have got to get out of this situation. >> reporter: from out of the blue, a tip. >> he had some information that was connected to her murder. >> reporter: that would reveal a diabolical plot. >> i just could not understand how this was reality. >> reporter: but was this killer too clever to be caught? >> he is extremely smart. smarter than we all are. shauna tiaffay hit the jackpot in las vegas. a handsome husband, an adorable daughter and a good job. but there is a dark side to sin city. sadly, the beautiful cocktail

waitress became its victim. in cases like this one, the husband is often a suspect but the crime scene was telling investigators something else. and they got a hot tip. but like so many things in vegas, nothing was as it seemed. here's keith morrison with "under a full moon." >> reporter: she was finished now. tired, wrung out. must have been as she walked away from the incessantly ' chirping machinery and the bleary eyes of the gamblers on holiday from real life who'd called out for her again and again and again. outside in the night, a full moon bathed the great houses of delight and sin in an unaccustomed shade of pale. it was september 29, 2012. at precisely 3:00 in the morning, in a back room of the palms casino, the cocktail waitress named shauna tiaffay inserted her time card in the stamping machine, and set out to break a little rule.

shauna had parked her car in the back lot, a practice discouraged because surveillance cameras were unable to track her all the way to her car. still easier this way. quicker. and after all, would a stalker really be waiting for her here, under a full moon? >> it was absolutely horrible. >> it was absolutely horrible. and we felt so helpless. >> it's every woman's worst nightmare. >> we didn't know if any of us were next. >> reporter: it never occurred to shauna to become a cocktail waitress when she moved to vegas as a 20-something back in the mid-90s. what she wanted then was to be closer to family, meaning big

sister paula. >> she originally just thought, "oh, there's no way i could be a cocktail waitress. i don't even drink." >> reporter: but in a casino town, a cocktail waitress could make good money. so now, at 46, she was a veteran. >> and she would laugh. shauna laughed at herself a lot. you know, she giggled a lot. and she would laugh at herself, and, you know, she'd say, "well, i still don't know, you know, what these cocktails are. you know, i -- i just order 'em and they give them to me and i go take them to the -- the people." >> reporter: but she was good at it. everybody could see that. >> all the customers loved shauna so much. >> why? >> she was a sweet person. >> beautiful. >> reporter: she made close friends.

a work family, really, including kelly chapman and stephanie vargas. >> i remember there was one time, i was in the -- i was at one of the bars and i saw her walk by. every single head turned on that bar watching her walk by. and i remember thinking, i'm like, "why don't i look like her?" because men, women, they -- they just loved her. >> reporter: but no one loved her quite the way he did. a handsome boy scout of a firefighter named george tiaffay. george was the genuine article. an all american good guy. he'd overcame early obstacles to become a top notch student in high school, a star athlete. this is his sister maria mcgrew. >> a valedictorian and on the football team. i -- >> yeah. you'd think he'd be just a jerk, right? >> yeah. >> just kind of a jock, mean-spirited sort of who knows, stereotypical. >> reporter: but it was quite the contrary, said maria. >> he was always the calming force amongst family and friends. you know, he was the gentle speaker. he had this outlook in life where, "i wanna go out and make the world a better place. i wanna go out and do something with my life." >> reporter: so george did. he earned a prestigious appointment to west point, and after graduation became a combat engineer, served as a nation builder in panama. his childhood friend, aaron solano, went down for a

visit. >> the stories he told me about the missions that he accomplished, building schools, clinics, roadways and bridges, really had an impact on his life. he finally felt like, "hey, i'm getting to do something." >> reporter: when george left the military with the rank of captain, he took a corporate engineering job, but soon realized that life in an office building wasn't for him. he wanted to work for real people, which is why george put aside that fancy degree of his and went to vegas to train as a firefighter/emt. >> focusing on himself was not

how he wanted to live his life. he wanted to serve. that was a favorite word of his, to serve. >> reporter: so while shauna served drinks at the palms, george served as a firefighter and found time to volunteer, do what he could for the down on their luck souls who live on the fringes of so much glitz here. in 2004, they had a baby. >> there's daddy and mama. >> she loved it. her daughter was the most important thing to her in this world and everything she did revolved around her daughter. >> dancing to everybody's favorite. >> reporter: and then, two years later, a marriage in hawaii. >> mama and dada just got married.

what do you say? >> just the three of them. back in vegas it was a busy, if complicated life what with george's 24-hour shifts and shauna's night times at the casino. and then it was september 29th, 3:00 a.m. she walked the empty lot to her car, started it, pointed away from the strip. and under that full moon headed home. no idea what was waiting for her. it was 9:00 a.m. when george arrived with their daughter. she'd spent the night at grandma's, he at the firehouse at work. but why was the garage door open? and what was that inside? george had grown accustomed to trauma and death. but this? do you want me to go first or do you want to go first, brea?

you can go first. audible reintroduced this whole world to me. so many great stories from amazing people. it makes me want to be better. to be able to connect with the people's stories that i'm listening to. that's inspiration. it's on during my commute, it's on all the time. doing the dishes. working out. while i'm in the car. at bed time. an audible listener is someone that wants to broaden their mind. people who are tired of listening to the radio, or music. to hear her speak those words. it was incredible. it was unbelievable. with audible originals, there's something for almost every taste in there. everything you ever wanted to hear. i signed up for getting a credit every month, and i started exploring books that i normally wouldn't read. our ability to empathize through these stories, with these stories, can be transformational. it's my own thing that i can do for me.

see what listening to audible can do for you. just text listen5 to 500500. see what listening to audible can do for you. -while you ponder that, consider adopting a rescue pet. there are 6.5 million of them; they all need a forever home. it would mean the world to them, and they will love you forever.

live ordinary, quiet lives. but this is where they found her. george and their 8-year-old daughter inside her own house. not so safe after all. >> i think i need to report a break-in and a murder. >> reporter: george would have

known even if he hadn't been an emt. >> what's going on there? >> she had been dead for hours. >> my wife.

my wife is on the floor, bloody, stiff, not moving. >> we-- we got a call in-- in the morning.

>> reporter: detective dan long has been in homicide a long time, and god knows, vegas has kept him busy. him and his partner terri miller.

>> when we arrived, there were fire department personnel everywhere. >> reporter: it was all too obvious. shauna had been attacked,

probably as she walked into her house, had been beaten with something blunt and hard. >> and there was things done with the body that made us think that there was possible sexual assault of some type and there was posing of the body. >> reporter: some kind of predator at work here? a predator who escaped with a good hunk of cash from the looks of it. shauna's purse was missing. >> cash and casino chips. they get tipped with casino chips quite a bit. they're known to make $300, $400, $500 in a night. they make a lot of money. especially if they're good. and we did send detectives over to the palms. they talked to them. they said shauna is one of the best employees they had. >> reporter: but something happened after she left the palms. so what? >> shauna was very beautiful. is it someone that saw her at

work and followed her home? >> there we are. >> of course, as the husband, george would have to be considered a possible suspect, too. so detectives pulled him aside, interviewed him right on the spot. >> george, do you understand the statement's being recorded? >> i understand. >> and you understand we want to talk to you about what happened this morning? >> yes, sir. >> reporter: george told the detectives that when he saw the garage door open, he had their daughter hang back while he went inside. >> i saw shauna's feet. just laying there frozen-looking. and, in my job, i know what that means. >> okay. are you a paramedic? >> i'm an emti firefighter. >> reporter: their daughter, thank god, didn't see anything, said george. he rushed her out to the street. >> i didn't know if there was somebody there. i just wanted to get out of there with my daughter. i'm just a normal person who got an awful skin condition.

with uncontrolled moderate-to-severe eczema, or atopic dermatitis, you feel like you're itching all the time. and you never know how your skin will look. because deep within your skin an overly sensitive immune system could be the cause. so help heal your skin from within, with dupixent. dupixent is not a steroid, and it continuously treats your eczema even when you can't see it. at 16 weeks, nearly four times more patients taking dupixent saw clear or almost clear skin compared to those not taking it, and patients saw a significant reduction in itch. do not use if you are allergic to dupixent. serious allergic reactions can occur, including anaphylaxis, a severe reaction. tell your doctor if you have new or worsening eye problems, including eye pain or changes in vision. if you are taking asthma medicines, do not change or stop your asthma medicine without talking to your doctor. help heal your skin from within. ask your eczema specialist about dupixent.

♪ protect your pet with the #1 name in flea and tick protection. frontline plus. trusted by vets for nearly 20 years. hilda, i like the new do. got some layers in there, huh? the more, the merrier. got to have this stuff in the morning. oh, that's too hot. act your age. get your own insurance company. carlo, why don't you start us with a little bit of cereal? you can spread it all around the table.

and we're gonna split the warm hot dog. and i'll have a glass of grape juice to spill on the carpet. oh, uh, do you want some to spill? act your age. get your own insurance company.

>> reporter: he had taken the little girl to shauna's place, he said, because it was shauna's turn. >> because we're currently separated and planning on moving

back in together because we started getting along again. >> reporter: and meanwhile, they had this complicated arrangement. shauna worked 7:00 p.m. to 3:00 a.m. at the casino. george, as a firefighter, worked long shifts and got lots of days off. their daughter shuttled back and forth between them and when they were both at work, the girl spent nights with george's mother. >> okay. what shift did you work yesterday? >> a 24-hour shift.

>> reporter: so he was at work when shauna was killed. of course, they did some checking, just to be sure. >> you know, if he was there on marks that were seen on shauna's body, we thought that it was possibly a hammer. so no one knew that but the two of us. >> but this guy brings it up. that's -- >> exactly. >> reporter: a homeless, drug addicted ex-con with a volatile temper, said big will. certainly seemed to fit the profile of the potential predator detectives were looking for. but big will told them, finding greyhound might not be so easy. >> he told us that greyhound walks everywhere. he lives out in the desert. >> reporter: but big will wanted to help, he said, so he agreed

to take them to some of the places where he thought greyhound liked to hang out. and what do you know? they ran into him in the parking lot of a gas station. detective long approached him. sweet as pie, greyhound was. said he'd be perfectly willing to go to the station and have a chat. his real name was noel stevens. >> what did he tell you? >> he knows shauna. he knew where they lived. that he did yard work and handyman work for george and everybody else in the neighborhood. >> reporter: so, someone shauna knew. someone george -- the do-gooder -- had tried to help. a thing not out of character for george. but greyhound, or, noel, was adamant that he had nothing to do with shauna's murder. then he agreed to show the detectives his campsite out in the desert. >> what'd you find? >> swimsuit bottoms that in our search of shauna's house appeared to me that matched the top that i had seen in her bedroom. there was also an extra small black dress, which, you know, shauna was very tiny. >> reporter: so, greyhound was the burglar poking around shauna's personal things. and in fact, her friend recalled shauna had grown uncomfortable

with this particular charity case who'd been doing work around the house. >> she didn't want noel in the house anymore. and she said, you know, "you're -- you better get out of this house or i'm calling the police on you." >> reporter: so was he the killer? out at the campsite, detectives did not find any evidence linking him to the murder. so, they kept looking. >> one of the other things big will told us was that noel had a campsite number one and a campsite number two. >> reporter: a second campsite. out there somewhere. but where? and what -- if anything -- was hidden there? >> coming up -- >> under the bush, he saw a pair of jeans that appeared to have blood on them. sau mmm! don't deny your cravings. eat 'em! all the flavors you crave, in a superfood.

blue diamond almonds. crave victoriously. [ text notification now that you have] new dr. scholl's massaging gel advanced insoles with softer, bouncier gel waves, you'll move over 10% more than before. dr. scholl's. born to move. i'm and i'm an emt.erer when i get a migraine at work, it's debilitating. if i call out with a migraine, that's one less ambulance to serve a community. i just don't want to let these people down. excedrin migraine. relief that works as hard as you do.

here, hello! starts with -hi!mple... how can i help? a data plan for everyone. everyone? everyone. let's send to everyone! [ camera clicking ] wifi up there? -ahhh. sure, why not? how'd he get out?! a camera might figure it out. that was easy! glad i could help. at xfinity, we're here to make life simple. easy. awesome. so come ask, shop, discover at your xfinity store today.

>> a dark discovery seems to provide answers. so why are detectives about to confront a series of new and troubling questions? when "dateline extra" continues. hi.

hurricane matthew churning towards jamaica and haiti. expected to make landfall tomorrow night. torrential rain and flooding wreaking havoc across the capital. the storm could trigger deadly mudslides. stevens reported to be a homeless drug addict had likely burglarized shauna's home, but they still had no evidence that stevens was responsible for her murder. as their search continued, they made a discovery that could have provided answers but only deepened the mystery. let's return to keith morrison with "under a full moon." sightseeing itinerary, not this way, but this, too, is las vegas. rugged desert terrain that is a kind of refuge or hiding place for the desperate and troubled. >> believe it or not, that whole area has homeless people that are up there. >> reporter: this is where greyhound took them. so detective miller went up with the police air unit to have a look around. >> those two pilots decided that they were going to fly that

whole area for us, and they actually located the second campsite. and we entered and we found a citation in the name of noel stevens. so we were at the right place. >> reporter: so they spread out. kept looking. and pretty soon, one of them called out. >> about 175 feet from the tent, he found a bush. and under the bush he saw a pair of rolled up denim jeans that appeared to him to have blood on them. >> we put those in for immediate dna testing. >> how did that come back? >> it was shauna tiaffay's blood, and the pants were worn by noel stevens. >> that's kinda your story there, huh? >> that's kind of our story there. >> reporter: proof the homeless handyman george and shauna tried to help was a murderer. but could the story be that simple, really? listen to shauna's sister paula, for example, and things start to sound a bit more complex. >> well, i just think that he always loved himself more than he loved anyone else. and it was all about him and what he wanted. >> reporter: that was george she was talking about. the selfless firefighter had

another side, said paula. >> the verbal abuse, the intimidation, the control. i mean, george was always a controlling guy. >> hold the camera in your hand. push it away from us. >> reporter: according to paula, george had become ever more controlling, and judgmental, especially about shauna's spending habits. >> first time at the beach.

>> reporter: only got worse when shauna told george the marriage was over. >> he said, you know, "if you don't come back to me and we can't sort this out, you're gonna lose custody of your daughter." and that was -- >> that was his threat. >> -- her number one fear. oh, absolutely. he used their daughter as a way to manipulate shauna, time and time again. >> reporter: shauna had been letting her work mates read the text messages george sent as things got worse in the marriage. >> one text, it would be nice, you know, short and sweet. like, "i love you. i've been thinking about you all day," "we need to work things out." and then, you know, we would be working. she wouldn't be able to text him back right away and ten minutes later, he's blowing up her phone cussing her out, calling her names. >> reporter: shauna's supporters remembered her funeral quite differently than george's people did. >> he had no emotion. no emotion at all. he did a eulogy, talking about how much money shauna liked to spend, and that there was one time she was at the gas station and accidentally left the pump in the car. >> in the eulogy? >> in the eulogy. and i watched him walk off with my little niece, you know, 8 years-old, just lost her mom, and i watched him walk off with her. and i thought, you know, this is exactly what he wanted. he wanted all the control over my niece. >> reporter: paula told the police her suspicions even before they began chasing down leads on greyhound. so even though they had their killer, the idea that george was involved somehow was already in

the back of their minds. on the other hand, george's family was just as eager to assure the police that those attacks on george's character from shauna's side were complete nonsense. >> i never saw shauna act cowed or afraid of my brother. she had an equal footing in the way they interacted with one another.

so that's -- that's why i still can't believe the -- the insinuation, the allegations that -- that he was abusive, or even controlling. >> reporter: george's friend aaron solano couldn't agree more. >> no matter where he finds himself -- what challenging situation he finds himself in, he has always been consistently kind, consistently caring. >> reporter: so which george was the real one? the detectives decided to pay george a visit at his house, though they didn't tell him what they'd heard about him. the good or the bad. >> mr. -- can i call you george? >> yeah, call me george. >> thank you. >> reporter: george said, sure,

he knew greyhound. but said he'd never heard him called noel stevens before. >> you knew him as something else? >> i knew him as neal smith. >> reporter: george told detectives how he and shauna had befriended this neal smith. tried to help him get back on his feet. >> me and the wife kind of looked at him like our little charity case because he was a nice guy and was down on his luck. >> reporter: by now the detectives knew greyhound was an addict and a big drinker. so they asked george. >> was he a drug user? >> nothing. >> okay. alcohol? >> yes. he would drink alcohol, but not a lot. just a beer or two. >> just a beer or two every now and then? >> yeah. >> reporter: remember, george said he'd never heard the name noel stevens before. knew greyhound only as neal smith. so, was it an honest little slip or was george hiding something? >> is it possible he was confused about the name, that it, you know, greyhound used several different names? >> when you get nervous you're gonna revert back to whatever is natural. and he reverted back to noel. he just got done telling us, "i've known this man for years as neal," and then, "noel helped me move." >> coming up, a bold calculation by detectives was about to to trigger a stunning chain reaction. to pay them

off faster. lending tree made lenders compete for my business and i ended up with a loan that saved me over $9000 and no more credit card debt. i mean $9000! it's a lot of money. lending tree, may the best loan win. of savings and service. whoa. travis in it made it. it's amazing. oh is that travis's app? it's pretty cool, isn't it? there's two of them. they're multiplying. no, guys, its me. see, i'm real. i'm real! he thinks he's real. geico. over 75 years of savings and service. who got an awful skin condition. with uncontrolled moderate-to-severe eczema, or atopic dermatitis, you feel like you're itching all the time.

and you never know how your skin will look. because deep within your skin an overly sensitive immune system could be the cause. so help heal your skin from within, with dupixent. dupixent is not a steroid, and it continuously treats your eczema even when you can't see it. at 16 weeks, nearly four times more patients taking dupixent saw clear or almost clear skin compared to those not taking it, and patients saw a significant reduction in itch. do not use if you are allergic to dupixent. serious allergic reactions can occur, including anaphylaxis, a severe reaction. tell your doctor if you have new or worsening eye problems, including eye pain or changes in vision. if you are taking asthma medicines, do not change or stop your asthma medicine without talking to your doctor. help heal your skin from within. ask your eczema specialist about dupixent. with this one little nexgard chew comes the confidence, you're doing what's right, to protect your dog from fleas and ticks for a full month. it's the #1 vet recommended protection.

and it's safe for puppies. nexgard. what one little chew can do. - when you're volunteering, "it's not my job."r that's because right where you live, there's a need for your time and skills and effort and talent. please consider volunteering and feeling that feeling that you helped someone today.

welcome back to "dateline extra." i'm tamron hall. to detectives investigating shauna's murder, something just wasn't right with what her husband george was telling them. especially about how well he knew the homeless handyman who they believed killed shauna. but now they wondered, could george have also played a role in her death? here's keith morrison again with "under a full moon." >> reporter: it's an old police tactic to stimulate -- maybe upset -- a suspect you haven't quite cornered, hoping for an overreaction. sometimes it works, sometimes not. so even though they didn't have a solid case yet, the detectives let word slip that they intended to arrest george, charge him

with murder, hoping he would do something rash and maybe incriminate himself. >> he was told by his former attorney that he was going to be arrested. at the same time, police officers were showing up at my mother's doorstep. >> reporter: what did george do? got into his truck, raced over to his mother's house, dropped off his daughter, roared off again. police watching. >> he was driving extremely fast. he was forcing vehicles out of his way, forcing vehicles off the road. and then plowed straight into a cement barrier. the officer following said, "he just committed suicide." >> what did you think when you got that report, when you heard about that? >> well, i think it was a very good indication to us that we were definitely on the right track. >> reporter: but, if suicide was his intent, as the detectives

assumed, it didn't work. his injuries were not severe. still, it looked to detectives like a guilty george would rather kill himself than face a murder charge. and as george lay in a hospital bed recovering, noel stevens gave police the final piece they needed. he confessed that he killed shauna and said his good pal, george, asked him to do it. >> so we went to see him at the hospital. we went in and told him that he was under arrest. >> did he say anything? >> he asked to speak with his attorney. >> i just knew that george had something to do with it. >> reporter: both george and noel were booked on murder, and conspiracy and burglary charges. >> george is the one that wanted shauna dead. george is the controlling man that needed that control of shauna. and he had a tool at his disposal that worshipped him,

that loved him, that would do what needed to be done. >> reporter: noel stevens pleaded guilty to several charges, including murder, and spent the next three years cooperating with the investigation. stevens was later sentenced to 42 years to life. george, who pleaded not guilty, set up a ministry in the clark county detention center. and george's sister maria remained convinced he did not do it. >> why, the age-old conclusion, the husband always does it. >> he was a statistical suspect from day one, for sure. my opinion is, they sandbagged around that to make a case. >> reporter: why, she asked, would anybody believe an addict and known liar over george? and the detectives' theory that a guilty conscience led to a suicide attempt? that was hog wash, said maria. >> but let me tell ya, he has been on suicide prevention squads, he's an emt. he is quite knowledgeable about what it takes to kill yourself in a vehicle. so, driving that large vehicle into a k-rail with your seat belt on is not how an expert tries to commit suicide. he did something stupid, but he didn't try to kill himself. >> reporter: and it wasn't just george's family who stood firmly behind him. fellow fire fighters came to his defense, fellow west point grads, childhood friends. >> i truly believe he's innocent. he gives too much of himself,

and i think that that is one of the reasons he finds himself in the situation he's in. >> were you surprised at the amount of support that george got? >> no. no. george, he makes lifelong connections. it's part of his generosity. >> reporter: and so, on a searing hot summer day in late august, 2015 -- >> good morning. >> reporter: -- those lifelong

connections sat on one side of a las vegas courtroom. >> george was adamant that this go to trial. he would not accept any plea deals, anything. we all agreed with him, family and friends. good, do that. we want to show people that this is all wrong. >> reporter: and on the other side, a sea of hot pink. >> there were just an outpouring every day. you know, lots of people that showed up wearing pink, and -- >> why that?

>> pink was shauna's favorite color. and not pale pink, hot pink. >> reporter: ex-work mates were there, too. >> i wanted the jury to see that she wasn't just a vegas cocktail waitress. you know, that she was a good person, a beautiful person, a good human being. >> reporter: prosecutors mark digiacomo and pam weckerly told the jury that while noel "greyhound" stevens was the admitted killer of shauna tiaffay, he never would've done it had george not put him up to it. >> he's got this singular goal of, i need to kill my wife. and he has to keep pushing noel to do it. >> reporter: shauna's sister paula testified that she encouraged her sister to move out. >> i told her that based on the things she was telling me about that had been going on for quite a while, that i believed that she should separate herself from george and move to a different home. >> reporter: so she did and george increased his contact with noel. his phone calls to stevens in the month before the murder proved a conspiracy, said the prosecutors. they showed the jury george's phone records. >> if you looked at how much he called noel, there's 87 phone calls. >> that's three or four calls a day.

>> yes. his mother is about once a day. >> reporter: then, they said, look at this. here are george and noel shopping together. buying gloves, dark clothing, a knife. and on four different occasions they bought hammers. >> this ends up at mr. tiaffay's house where he happens to have two other perfectly good hammers in the garage. >> reporter: what else could all this have been, they asked, but a murder kit. one final thing. greyhound told the cops that he got into shauna's place with a key george gave him. and look at this. here's george at the hardware store, buying a key just like the key noel used. only one possible conclusion, said the prosecutors. >> noel stevens used the hammer. the person who used noel stevens is george tiaffay. >> reporter: ahh, but -- >> it's a good story, it's real interesting, but it's not evidence yet. >> reporter: this is george's defense attorney, robert langford. >> there is absolute reasonable doubt as to george tiaffay's involvement in this case. >> reporter: those surveillance videos, for example, that the prosecution found so damning? none of the hammers they bought was the actual murder weapon. and besides, most of what they bought together was simple --and innocent camping gear. george helping a man in need, as usual. >> he thought he was helping out noel stevens to live out where noel wanted to live, which was

outside of town. >> reporter: as for the 87 phone calls the prosecution said proved george and greyhound had conspired to kill shauna, there was nothing sinister there, said the defense, just a man trying to contact his charity case handyman. >> i live out in that area. and cell service is notoriously bad. on top of -- have you ever tried to call a handyman in this town? it is ridiculously difficult to get hold of those kinds of workers to come do work. >> reporter: in fact, said the defense, the only thing the state had tying george to the murder was noel stevens's word. >> without noel stevens's statement to the police, george is an innocent man. >> reporter: and how could the jury believe stevens, said the defense, when even his own friend, the tipster big will said -- in court -- that the man was an habitual liar. >> honesty, i would put him at a scale of 1 to 10, i would put him at a scale of maybe 1 1/2. >> ten being very honest and >> one and a half, meaning not honest at all. that's correct. >> reporter: george's attorney was itching to cross-examine the habitual liar who'd condemned his client. which presented the prosecutors with a dilemma -- the man at the center of their case against george might just destroy it. >> he could be a real problem. >> he could be a real problem. and there was a substantial amount of discussion between pam and i over whether or not we're calling him or not. >> does that imply that you disagreed? >> oh, yes, we disagreed. >> coming up, a risky decision looks like it might just backfire. >> do you hear voices? >> yes.

in terms of treating sensitivity, 3 days is really fast. sensodyne rapid relief is a game changer. it's going to let the dentist offer their patient sensitivity relief in 3 days. say over the course of a weekend you're going to

start feeling significant results. i never thought i'd say this but i found bladder leak underwear that's actually pretty. always discreet boutique. hidden inside is a super absorbent core that quickly turns liquid to gel. so i feel protected and pretty. always discreet boutique. imagine if we we would be such good friends. best friends. advantage ii, kills fleas through contact all month long. i mean he's a wreck without me. advantage ii, fight the misery of biting fleas. -keith used to be great to road-trip with. but since he bought his house... are you going 45? -uh, yes. 55 is a suggestion. -...it's kind of like driving with his dad. -what a sign, huh? terry, can you take a selfie of me? -take a selfie of you? -yeah. can you make it look like i'm holding it? -he did show us how to bundle home and auto at progressive.com and save a bunch of money. -oh, a plaque. "he later navigated northward, leaving... progressive can't protect you from becoming your parents.

but we can protect your home and auto when you bundle with us.

to make, and the case hinged on the outcome. here's keith morrison with the conclusion of "under a full moon." reporter: prosecutors marc digiacomo and pam weckerly had a big problem, and they knew it. the problem had a name. noel stevens. greyhound. >> noel is a very important piece of information, but he's also the biggest risk. >> reporter: in the credibility sweepstakes, he's way down here somewhere and -- >> absolutely. >> reporter: your defendant is way up there. >> reporter: and so they argued. these two prosecutors. she said put him on the stand. >> my thought was you don't

understand who george is and how sinister this was until you meet noel and say this is the person that he gave access to. >> reporter: he said, don't take the chance. >> they could say this crazy, psychotic, homeless man did it on his own. >> reporter: who prevailed? she did. >> the state calls noel stevens. >> reporter: and so up went greyhound to the witness stand and offered his grisly story. >> i hit her in the head. >> when you hit her in the head, what happens? >> she hits the floor. >> and after she hits the floor, what do you do? >> i jump on top of her. >> and after you jump on top of her, what do you do? >> i keep on hitting her. >> how long do you hit her for? >> i hit her until she doesn't move anymore. >> reporter: why? because, he said, someone told him to. >> who told you to kill shauna? >> george. >> reporter: but was it true? now the defense got to ask greyhound about, well, for starters, his addictions. >> yes and vodka. whatever i could get my hands on. >> you'd drink it every day? >> every day. >> just one or two?

>> i'd drink it til there ain't no more or until i don't have no more money or i drink. >> reporter: yes, and he smoked weed, he admitted, and did speed. but it got worse. >> do you hear voices? >> yes. >> do you remember saying to that person that they sounded like monsters? >> yes. >> reporter: hallucinations, too. >> what kind of hallucinations? >> i see, eh, shauna sometimes. >> sometimes? >> yes. >> do you see other people? >> sometimes. >> well, i think everybody agreed that noel stevens is crazy as an outhouse rat. >> reporter: how could you believe a man as crazy as that? >> you are outside of reality at that point. >> reporter: you can't trust the

primary witness. >> they just, they didn't have it. >> reporter: so, a man who hears voices? that got the jury's attention. one juror submitted a question read by the judge. >> did the voices you said you would hear from time to time ever tell you to kill shauna? >> no. >> reporter: there was the choice for the jury. george used noel as a murder weapon, or the drunk who heard voices killed shauna and blamed an innocent man. the lawyers, the friends the family -- from both sides, could only sit and wait. >> it was nerve-wracking. >> reporter: for three days, they waited. the prosecutors, once confident, worried. >> the hung jury. >> it's the hung jury situation. and so by day three you think, uh-oh, is there a holdout. >> count one. >> reporter: then finally, here it was. >> guilty of first degree murder. >> guilty.

george tiaffay, his face almost serene, absorbed the verdict. >> it was so much relief. >> closure. >> it was just this big weight taken off my shoulders, you know, because i felt this entire time that shauna hasn't had a voice in this. and, i've been so worried about representing her right and saying the right things, and making sure that i portray her as the -- the wonderful person that she was. >> both george and noel were sentenced to life. george has no chance at parole. but what felt like justice to some, to others, did not. >> and here's this little kid who was happy-go-lucky and smart and valedictorian, the football player and the west point grad and the upstanding guy you could all look up to. >> yeah. right. good guy. >> reporter: locked away forever. >> he's gonna be in that horrible place. i hope, pending appeal, he finds purpose for himself there, and i think he will.

he's that kind of person. >> reporter: and the young girl at the heart of a tragedy is living without either parent and with a story that is different, depending on which side of the family is telling it. >> i really do feel that my niece is the true victim in all of this. it's so tragic, and i just don't have words for what she's going to have to come to terms with and understand as she gets older, you know? it's, it's really tough. >> reporter: she lives with george's mother, the woman with whom she's spent so much of her life. and paula? paula plans to make sure the daughter of shauna tiaffay never forgets. >> we talk about her mom, and how much she loved her, and what we think her mom would want for her now. >> that's all for this edition of "dateline extra." i'm tamron hall.

thanks for watching. >> i'm craig melvin. >> i'm natalie morales. ." and this is "dateline." >> she had been fearless on the front linesee in iraq. >> pretty amazing. i saw her as like a really strong iksoldier. >> butal something had her terrified at home. >> i'm scared. i don't feel safe. >> a desperate call to police and then she vanished.