next week. >> she had her whole life ahead of her. you know, she had a good job. she had her house. her little dog. she loved her dog. her life was just beginning. no one deserves this. >> reporter: posters, searches, heartache. >> she had a heart of gold. she was there for everybody! >> reporter: her name was carrie. and one monday morning, she went >> i saw the tattoo. cephaland . >> someone is in her car. someone is at her bank. but most jaw dropping of all, someone is up on stage with a song turned sinister. >> i couldn't believe what i was hearing.

we need to figure this out fast. >> here is andrea with without a trace. >> a sad fact of life, gone without a trace. nationwide there are almost 100,000 active missing persons cases. since december 2013 date line's online missing in america series has been telling some of those heartbreaking stories. one of the first came from the heartland where not everything is serene. this is the quadcity, urban, industrial industrial, gritty. four cities split by the mighty mississippi river -- two on the iowa side, two in illinois.

sometimes uneasy mix of old-fashioned midwestern values and modern urban life, where crime is an inescapable part of the landscape. this is where carrie olson went missing in december of 2013. >> she had a heart of gold. and she made you always feel welcome. >> amanda smith and carey were amanda smith and carrie were b.f.f's from the moment they met at as 11 year-olds at a neighborhood pool. >> we were just swimming together one day, and sparks just flew. >> how do little girls have sparks? what was it about carrie? >> she was outgoing, fun. she'd push you in the pool. she'd splash you. and she'd give you the best bear hugs. you know, just would send tingles through your body and made you feel so special. >> reporter: the vivacious carrie was a people person and according to sarah paxton, another friend, a dog person too. she loved her kolby.

she loved, loved, loved kolby. kolby was like her child. >> 29-year-old carrie worked in her father's flooring and carpet store. >> carrie was a bit of a daddy's girl? >> she was. >> reporter: is that fair? >> yeah. >> her dad seemed to do a lot of things for her? >> he did. if she needed something, he was there taking care of it. >> reporter: but carrie was trying to find her own way. she lived in her own house and dreamed of, one day, walking down the aisle. >> she wanted to be loved. she wanted a family. she wanted something stable in her life. >> reporter: the outgoing carrie had no trouble meeting guys, but hadn't found mr. right. >> carrie was such a sweetheart. she was always bubbly. >> reporter: kelly hornick is a nurse who moonlights as a bartender at a karaoke joint named jimmy o's. carrie was a regular. >> she was always well behaved. always there just hanging out with her girlfriends, having a good time. i think they came here for karaoke.

>> reporter: it was at jimmy o's where carrie met tim mcvay. from the moment they laid eyes on each other, they were smitten. >> they were flirty with each other. you could tell that they were both interested. it's cute. >> reporter: tim studied theology at augustana college. he planned on becoming a minister, but felt he was just too young and inexperienced to live up to the responsibility. so he took a dramatic u-turn and found a very different calling in bars and clubs as the karaoke king of the quad cities. >> he was very good at running karaoke. he was funny. he entertained the customers. he got out there and danced with 'em. he would sing songs. he's a good guy. >> reporter: tim, a divorced father of two, was ten years older than carrie. but that didn't seem to matter. they were having fun. and carrie could imagine a future together. >> she saw everyone around her getting married and having children, myself included.

interested in having more children and that was a deal breaker for carrie. so they decided to go their separate ways. carrie soon started dating justin mueller, an iraq war vet, with a very different personality from the gregarious, fun-loving tim. >> he seemed very quiet. pleasant. he was polite. he was nice. he seemed a little awkward. >> reporter: despite his quiet and awkward demeanor, justin looked like a good fit for carrie. he was closer in age, hard working, loyal. and he seemed to find a place in her heart. so, they moved in together. it was a big step. for carrie, it was the first time she had set up house with anyone. but right from the start, it wasn't the happily ever after kind of life carrie dreamed about. the iraq war left justin with a difficult case of post traumatic stress disorder. >> i felt like it wasn't a good match.

home, where carrie was always wanting to go out and do things. >> reporter: did you sort of see that as, like, "this is gonna be -- i can see this is gonna be a problem?" >> i did. i saw, like, a clash. >> reporter: then, just three weeks after justin moved in, there was a problem and it was a big one. carrie suddenly disappeared. it was a monday, december 13, 2013. the start of a work week. carrie didn't show up at the store and didn't call in. not like her at all. something was wrong? >> right. i called her, i could tell her phone was off. it was going straight to voicemail. and i thought about calling hospitals. i just was scared. >> reporter: not home. not at work. not in touch. where was carrie? >> it was on innews and on facebook.

carrie. >> it is traumatic and overwhelming. maybe signs of trouble. >> stomping out. carrie was upset. so how ya doing? enough pressure in here for ya? ugh. my sinuses are killing me. yeah...just wait 'til we hit ten thousand feet. i'm gonna take mucinex sinus-max. too late, we're about to take off. these dissolve fast. they're new liquid gels. and you're coming with me... wait, what?! you realize i have gold status? do i still get the miles? new mucinex sinus-max liquid gels. dissolves fast to unleash max strength medicine. art the relief. ditch the misery. let's end this. recently we've noticed some ads created by these two birds, inviting you to stay away from

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>> dennis harper is the founder of the quadcities missing person's network. >> whenever there was anything newsworthy, it was posted. it was in the news. it was on facebook. >> reporter: carrie's best friend amanda was a big part of that. >> on new year's day i did create a find carrie olson facebook page. and people were sharing it left and right. so her story was getting out. i even contacted dateline and they published her story. >> reporter: when we posted carrie's story as part of dateline's online missing in america series, it reached 1.9 million people, and was shared 42,000 times. did you feel like that was something that could help? just getting it out on a national level? >> think it helped out a lot. >> reporter: thousands started to follow amanda's page. carrie's story united the quad cities in a remarkable way. everyone wanted to help and everyone was hoping for a break in the case. but they were also on edge. did you just start to have worse and worse thoughts as you waited? >> i did. >> reporter: what are you told about what's going on with carrie? >> that she did not show up for

the family was concerned. >> reporter: the family was so concerned they called the police. the case went to detectives rick voy and bill thomas of the davenport police department. they say carrie's live-in boyfriend justin told them he had no idea where she was. >> justin didn't have any answers. >> reporter: justin said he and carrie had a fight, she stormed out of the house and he hadn't seen her in two days. >> carrie was upset. >> what did she say to him? >> said somethin' to him about bein' stupid >> reporter: carrie's ex, tim mcvay, was in las vegas on vacation when he was told she was missing. he and carrie were still close friends and said he wanted to help and had an idea. he talked to carrie's father dave about where to look. >> tim told him, hey, she could be at my place. go over and look. there's a window open. you can crawl into the window and search the house. >> dave went over there and searched. >> yes. >> he did. >> reporter: did he see

>> nope. >> reporter: no carrie at tim's. no carrie anywhere. and one thing left behind at her house was a sure sign something was terribly wrong, her beloved dog kolby. >> her everything was kolby. just like a little kid. and if she did go somewhere kolby was either with her, or she would make arrangements for kolby. there was -- she would never just leave. >> reporter: kolby being at home without carrie led detectives voy and thomas to a grim possibility. >> as detectives, do you have to consider that someone might have taken their own life? >> in a missing person's investigation, that's always a possibility. >> reporter: amanda gave that theory some weight. she said there was a sadness behind carrie's bubbly personality. >> i started thinking that maybe she committed suicide somewhere. >> did you think that carrie was capable of taking her own life? >> well, she seemed depressed at times. >> reporter: still, detectives

warrants, the first at the house carrie shared with her boyfried justin. >> the search warrant that we prepared for carrie's house included everything that justin owned and justin's vehicle. >> reporter: justin's truck was checked and photographed. and a sweep was made of the house. it was tidy. undisturbed. didn't look like a crime scene. another search was done at ex-boyfriend tim mcvay's house. >> we wanted to get into his residence and see was she there, was she not there. were there any clues that we needed to go on. >> reporter: detective tina noe executed the search on tim's home. >> we took lots of photographs. 'cause you never know what's gonna be important possibly later on. >> reporter: tim was in the middle of a major renovation. the house was a mess. random things were strewn everywhere; clothes, construction materials, rolls of carpeting. but nothing looked like a good lead. carrie's family was growing increasingly desperate. they wanted to do something.

when they reached out to dennis harker of the quad cities missing person's network. sadly, he knew just what to do. >> it's traumatic. i mean, it's just a crisis. and and it's overwhelming. >> reporter: his own son went missing just a few months earlier. >> you find yourself being tireless. you know, you can't sleep anyway, you might as well be doing something. >> reporter: dennis offered suggestions and organization to find carrie and keep her story public. it was a remarkable effort. a reward was offered. a prayer vigil became a moment of peace, and faith. and, of course, there were endless searches. dennis led one at the mississippi river, where his son's body had been found. >> the mississippi tends to collect a lot of people that go missing. >> reporter: amanda was with dennis for one of his river searches. >> maybe she had drowned or been dumped in the river. so we started looking along the river. and i was lifting up everything

her. because she would have done it for me. >> sarah paxton was searching, too. she remembers the frustration of trudging through a huge park covered with a fresh blanket of snow. >> every search, i felt smaller and smaller. and the world felt bigger and bigger. she was one of my closest friends. i loved her dearly. it just felt like a needle in a haystack. >> her friends and family would not stop looking or hoping. dozens of tips came in from strangers, well wishers, even psychics. it would be something much closer to home that would finally lead to the first clue about what really happened. >> coming up -- >> had you ever heard anything about justin stalking carrie?

>> new questions about carrie's new boyfriend.

getting ready to end the >> reporter: the people of the quad cities were desperately searching for carrie olson. and law enforcement on both

doing their best pushing the investigation as hard as they could. for detective tina noe, solving the case became a mission. >> reporter: finding someone quickly is very important. >> it is very important. and it was bothering me. where is she? what could've happened to her? we need to find answers. >> in murder investigations, eight out of ten suspects and victim know each other. >> reporter: and that meant taking a harder look at carrie's boyfriend, justin mueller. detectives started by talking to carrie's family about him. >> we rely heavily on the information that families give us early on in an investigation. >> reporter: but carrie didn't share details of her love life with her family. they didn't even know justin had moved in with her. it turns out the person carrie did confide in was her ex-boyfriend, tim mcvay. >> to me, it appeared that they were best buds. they talked daily.

20 times a day via text. the main way of communicating was text messaging. >> reporter: tim drove straight to police headquarters when he flew back from las vegas, saying he wanted to help. >> i want to talk to you about carrie. >> absolutely. >> you know, that's why you're down here, right? >> anything you want to know. i don't know where she is. i don't know what she's doing. i very much want to know because i am concerned. >> reporter: it turned out tim also had a lot of concerns about justin, which he shared with the detectives. he said the problems started even before justin moved in to carrie's house. >> she called me out of the blue one afternoon freaking out because this guy justin that she had been dating was kind of stalking her. >> reporter: it was something best friend amanda also worried about when carrie went missing. >> reporter: who did you think would wanna hurt her? >> i immediately thought justin. >> reporter: had you ever heard anything about justin stalking carrie?

drive by her house before he ended up moving in. he wanted to be with her so bad. >> reporter: and then there was justin's posttraumatic stress disorder. carrie had talked to her about it and she could relate. amanda's own military husband also struggled with ptsd. >> reporter: that could be a lot to handle, if you're not used to that and then you start dating a guy with ptsd.? >> it is a lot to handle. >> reporter: tim told police that carrie thought her relationship with justin had reached a tipping point. >> she goes yeah i can't do this anymore. i can't even keep pretending this is going to be okay. >> reporter: tim then speculated to police that the problems in the relationship had escalated into that saturday morning fight. >> her and justin got in a fight. she didn't really want to go back and get into more. she wanted him to learn a lesson. >> reporter: and how did tim know about that fight? carrie had gone to his house

huff and told him all about it. >> it sounds like she was getting ready to maybe end the relationship with justin. >> reporter: tim went on to tell police that he dropped carrie back home the next morning. >> i watched her go into the garage. >> reporter: he then borrowed her car and headed to the airport for his trip to las vegas. but when detectives spoke to justin, he said after carrie stormed out, she never came back home, and he hadn't seen her since. and that made a tip called in to police all the more intriguing. >> reporter: you all get a tip that there's a man looking for carrie in the milan area. >> yes. >> reporter: that deserved a close look because two days after she disappeared, her phone which hadn't been connecting to her cell network suddenly started pinging in the nearby town of milan. the man with the tip said the searcher was carrie's boyfriend. >> reporter: did you think it

>> justin. >> reporter: but justin had another story to tell. he said he wasn't in milan and insisted the fight with carrie was no big deal. that it was about something trivial. >> over some burnt eggs. >> reporter: and she had left that day, slammed the door and called him stupid? >> yes. >> reporter: justin insisted he never saw carrie again after that fight. and the morning tim said he dropped her at home and watched her go into the house. justin said that never happened. >> when one guy tells us, "i dropped her off here at 6:30 in the morning," and the other guy says, "she never came in the door." we know there's a problem. >> reporter: a boyfriend who had a blowout with carrie, and an ex who gave her a shoulder to cry one. one of them was lying but which one? coming up, a caught on camera stunner. who is that using carrie's bank card?

get $400 out. >> and a song turns sinister. the karaoke moment no one could believe.

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carrie olson's boyfriend and ex-boyfriend had given conflicting stories about the day carrie went missing and now police were taking a close look at both of them. >> that's kind of a tough thing to have to figure out when you've got two potential suspects. >> one of these two individuals is not telling the truth. detectives were trying to figure out which one, when they came across a significant clue. a trace on carrie's debit card led them to a gas station, where they looked at security camera video. it was chilling. there was carrie's car.

but there was no carrie. instead, the person using the card was tim mcvay. >> he's seen on video at the pump, trying to enter a number several times, you could tell, it's unsuccessful. >> reporter: tim also tried the card at a drive-thru atm at the mississippi valley credit union. but he had problems. >> that's carrie's bank. he is seen on video there three separate times, trying to get $400 out. >> reporter: the pin is not working? >> the pin is not working. >> reporter: why was tim driving carrie's car and using her debit card? tim told detective voy there was a simple explanation. even after they broke up, he and carrie always had each other's backs. >> we've been really close friends. she is the kind of friend if she called me i would drop whatever i was doing to go help her out. shirt off my back kind of thing. >> reporter: tim said that's why he had taken care of carrie when she came to his house after storming out on justin. and it also wasn't unusual that she lent him her car and debit card, he said.

she said go to the mississippi atm and get out $400 then go and top off the gas tank, whatever it takes to fill it up. >> reporter: tim said carrie had also promised to drive him to the airport in minnesota that sunday. but then she changed her mind at the last minute. >> she says just take my car and drive yourself up there drop me off at home. >> according to tim, he and carrie get into the car and he takes carrie back to her residence. >> reporter: and when they pulled up to the house, tim said carrie told him she didn't care how justin might react to her doing him a favor. >> she was saying i am going to walk in the door. and say i let tim borrow my car to get himself up to the airport. you need to shape up, ship out. >> reporter: detective voy questioned tim's version of events, saying security camera video from the genesis health clinic next to carrie's house did not show him dropping her off at home.

cameras on the side of the genesis where you dropped her off, it does not show you there. >> it has to show that the car was there. >> reporter: tim didn't realize it but detective voy was testing him. there was actually no video camera at the clinic. tim stuck to his story insisting he dropped off carrie. >> you're not in the video, and justin said, "she never came in that house." he's home. >> i don't know. >> she didn't walk into the garage and then walk away. >> i'm thinking justin's probably not being very truthful with you. >> reporter: it was clear one of them wasn't telling the truth and it was time to find out which one. >> reporter: did you ask tim to take a polygraph? >> did. >> reporter: did you give justin a polygraph? >> did. >> reporter: but when justin and tim took those lie detector tests, they both passed. and then they both went back to their lives.

them, hoping one might slip. >> reporter: one night later that winter, tim mcvay, the karaoke king of the quad cities, was back singing in front of a crowd. he sang, "i used to love her," by guns n' roses. i used to love her yeah but i had to kill her >> reporter: a woman at the bar, who was aware of the case, knew mcvay was a suspect. shocked by his performance, she said she shot this video to document it then gave it to detective noe. >> he says, "i used to love her, but i had to kill her. and i put her six feet under." tim knew what he was doing. and to get up there and sing that song? it was sickening. >> reporter: but that song was played frequently at the bar, and detective noe knew that tim's performance didn't prove anything. so with no physical evidence connecting tim to carrie's disappearance, there was nothing

wall. >> it was a mystery. we felt something just wasn't right. something was going on and we needed to figure this out. fast. >> reporter: carrie was still missing winter was settling in and it would be a long one. coming up, this brand new clue. this tattoo. >> i e-mailed amanda. it was a definite match. >> police are poised for a major break in the case. >> a huge piece to our puzzle. >> when "dateline" continues. here in the city, parking is hard to find. seems like everyone drives. and those who do should switch to geico because you could save hundreds on car insurance. ah, perfect. valet parking. hello! here's the keys. and, uh, go easy on my ride, mate. hm, wouldn't mind some of that beef wellington... to see how much you could save on car insurance,

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oh yeah, i'm all about more, teddy brosevelt. geico. expect great savings and a whole lot more. >> reporter: april 5th, 2014. warm weather, finally, after a merciless midwestern winter. melting snow led to a terrible discovery. >> a body had been found in minnesota that was similar to carrie's description. >> reporter: it was found unclothed, in a wooded area off a country road in the town of hastings, 300 miles from where carrie olson went missing. police circulated a possible identifying image, the dead woman's tattoo. >> i e-mailed amanda, and i

that's her tattoo, isn't it?" >> i had one picture of her tattoo. and i sat and compared it to the drawing on that news report. >> reporter: what is that moment like, when you look at the photograph of your friend and the photograph of the tattoo in the news report? >> i was completely empty. i called my mom and dad and i said, "there's a definite match for carrie in hastings, minnesota." >> this is where carrie olson's body was found on saturday night. >> we had mixed emotions, obviously. we wanted to find her but then finding out, you know, what had happened -- it was rough. it was a rough time for the whole community. >> i just sat there. i cried. i lost a confidante. i lost someone i could laugh with.

i lost a very good friend. >> reporter: the funeral was at st. paul's church in davenport. >> she got to come back home again. >> reporter: it was a day to lay carrie to rest and remember a beautiful life. but there were still so many unanswered questions. >> now we need to find out why. we need to find out what happened. >> reporter: first step, an autopsy. but it couldn't answer the key question for detectives. >> the doctor that did the autopsy called it homicide by unspecified means. >> reporter: no cause of death? >> no cause of death. >> reporter: are you thinking, "come on. there's got to be a cause of death? >> it's rare. but we had seen the photos of the scene, and you can tell that she didn't walk up there and just fall over dead, that her body was placed there. >> reporter: but the autopsy did offer a possible clue. >> the doctor had found a chunk

we remembered from january's search warrant that tim had beige carpet rolls in his house. >> reporter: but they also knew that carrie worked in a store that sold carpeting, so it might not mean anything. still, the carpet in carrie's hair and the carpet in tim mcvay's house were sent to the lab for analysis. how long did it take you to get your answer? >> it takes a while. it doesn't come back after the commercial break like on tv. >> reporter: while detectives waited for results, they explored the most tantalizing clue they had received, and it didn't come from carrie's body. it came from where she was found -- hastings, minnesota. >> we knew that's where tim parked his car before he went to the airport. >> reporter: when tim mcvay flew from minneapolis to las vegas the same weekend carrie disappeared, it turns out he left carrie's car in hastings. why? that's where his girlfriend at the time lived. pretty big coincidence.

that's what we call a clue. >> reporter: but detectives needed more. they had to tie mcvay to the very spot where carrie's body was found. they did have one long-shot clue. just a few feet from carrie's body, investigators discovered this $4 price tag. a google search showed the tag was for a kids' shovel sold at the discount chain big lots. detective thomas found a big lots store in lacrosse, wisconsin, where that kind of shovel was bought on the same day mcvay drove to minnesota. lacrosse is about two-thirds of the way between the quad cities and hastings but the store's security cameras were broken -- no video. so how could detectives tie mcvay to this purchase? they decided to work backwards. >> inside a tobacco outlet, he is seen on video. >> reporter: mcvay had told police that before driving to minnesota and the airport that sunday, he stopped to buy a

the quad cities. so, you knew exactly what time tim had been here -- >> exactly. >> reporter: -- and where he was going? >> correct. >> reporter: the big lots in lacrosse is a three and a half hour drive up highway 61 from the tobacco outlet. and it turns out, the shovel was purchased exactly three and a half hours after mcvay bought that cigar. >> that was huge for us. you leave the tobacco outlet, which is the exact amount of time to get to la crosse, wisconsin. >> reporter: but detectives still needed something more concrete to connect mcvay to the purchase of the shovel. >> so then we asked for the actual sales receipt. >> reporter: on the receipt was not only the shovel but a black bag. >> a black bag. >> reporter: a desage brand travel bag. it cost only $10, but it was the big payoff police had been looking for. >> we found it in the garage at tim's parents' house. that was a huge piece to our puzzle. >> reporter: so on july 18th,

after carrie's body was found and 7 months after she went missing, tina noe and the other two detectives went to a construction site where mcvay was working. >> tim was up on a ladder. and i said, "we have a warrant for first-degree murder for you and concealing a homicide." >> reporter: tina also brought along her signature accessory -- pink handcuffs. >> reporter: you chose to cuff him with your hot pink cuffs? >> yes. >> reporter: how did it feel seeing him in pink handcuffs? >> good. >> reporter: was it an extra little jab? >> yes. yeah, for tina. >> that was a good moment for us. >> mcvay, come on up. >> reporter: tim mcvay pleaded not guilty. he was denied bail and put in the county jail. that's where "dateline" found him for his first television interview. >> i did not kill carrie. and i did not dump her body. >> reporter: tim said the wrong

the fight carrie told him that she and justin had that saturday morning. >> reporter: did she say what the fight was over? >> romantic issues. i guess that'd be the best way to put it. >> reporter: of a sexual nature? >> that was my impression, yes. >> reporter: and then what happened after that? >> there was some throwing. a couple of things had gotten broken. there was a little bit of a physical altercation between the two of them. >> reporter: tim said the last time he saw carrie was when he drove her back to her house, just before he went to the airport. >> she was walking into the garage at her house -- alive, happy, as well as could be. >> reporter: tim said he still loved carrie, even though they'd broken up. but how could he explain the seemingly damning lyric -- "i used to love her but i had to kill her" -- that he sang at the karaoke bar while she was still missing? maybe not the best choice of song given --

actually, i -- i told >> reporter: -- what was going on -- >> i told my brother-in-law -- he was with me that night. i said, "why didn't you slap me when i put that song in? that's kind of a bonehead move." just -- but it had nothing to do with carrie. it was nothing to do with anything. it was just a song. >> reporter: but to prosecutors, it was more than a song. it was a look inside the mind of a killer. and they were determined to prove that in court. tim mcvay was about to stand trial for murder. >> a show down in court. one boyfriend accused and another on the stand. >> she stormed out of the door. i thought maybe i upset her. >> what really happened to carrie? >> i'm alex trebek. if you're age 50 to 85, i have an important message about security. write down the number on your screen, so you can call when i finish. the lock i want to talk to you about isn't the one on your door. this is a lock for your life insurance, a rate lock,

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trial started in june of 2015. there was no jury. judge michael meersman would decide. mcvay's defense attorneys believed they held the winning hand. >> he had passed the polygraph. so we thought this could be the truly innocent accused here. >> prosecutor john mcgehee knew he was facing a tough test. >> you had no cause of death. you had no weapon. you had no ironclad forensic evidence. >> i did feel that it could be an uphill battle. it was going to be a real challenge. >> as the trial began mcgehee presented the prosecution's theory as to how tim did it. even tugh there was no official explanation for how carrie died, the state presented something called burking -- a method of suffocation designed to leave no marks by sitting on someone's chest and covering their nose and mouth. to support that scenario, the state called one of mcvay's ex-girlfriends, cati smiddy. >> are you a little bit nervous today?

>> why are you nervous? >> i'm scared of him. >> reporter: cati described an incident one night in 2013. she said she was startled awake by mcvay sitting on her chest. >> i couldn't breathe, he had cut off my air, i couldn't -- he was, he's a big man and i'm not a very large woman i couldn't, i couldn't inhale. >> you moved out after that? >> yes. >> reporter: the evidence in prosecutor mcgehee's case was largely circumstantial, but he still felt it was strong. he believed mcvay was the last one to talk to carrie. he had her car, used her debit card, and her body was found just minutes from where he parked her car at his girlfriend's house. and the prosecution had the test results for the carpet fibers found in carrie's hair. they matched that rolled-up carpet in mcvay's house. >> how does a piece of carpet get lodged in someone's hair and remain in her hair?

mcvay's floor at the time of her death. >> reporter: the prosecutors also used mcvay's internet searches to show how he was constantly checking the website of the newspaper in the distant town where carrie's body was found. >> he knew that he had concealed her body in hastings. so he started accessing the hastings "star-gazette" in january, wanting to know the headlines when her body would be discovered. he accessed that website 100 times. that is an action of a guilty man. >> what were you looking for? you don't live in hastings. it's kind of a long ways away. >> a newspaper's a newspaper. but i'm not going to answer any questions about that. >> reporter: and why not? >> all i can say is a newspaper's a newspaper. i don't have any other comments about that. >> just interested in hastings? >> move on to your next question. >> reporter: finally, prosecutors called to the stand carrie's boyfriend -- justin mueller. he testified about the last time he saw carrie.

>> i didn't really have a chance to say good-bye. the way she left. i tried to say good-bye, yes. >> reporter: justin acknowledged that she was upset with him. >> the way she stormed out of the door, and i thought maybe i upset her in maybe some minor way or, cause i wasn't paying attention to her somehow. >> reporter: as the hours of carrie's unexplained absence and silence grew, so did justin's concern and his texts. prosecutors had him read them in court -- >> "baby, come home. i love you." "i'm sorry for whatever i did. i love you. kolby and i miss you." "is everything okay? i gave kolby his pill." >> did you get a response? >> no. >> now it's sunday night at 8:10. were you starting to get worried then? >> yes. >> reporter: although there was no evidence presented about mcvay's motive for murder, in closing arguments the prosecutors offered their

he killed carrie in a twisted fit of rage, because he demanded her car to get to the airport and she'd said no. >> we see it all the time that people are murdered for sometimes the smallest little things. and you're just surprised that another human being can do this to another human being. but that's what happened. >> reporter: mcvay's attorneys -- aaron dyer, dan dalton and john ruud -- argued that the prosecution's theory of motive was preposterous. >> the idea that he could kill her and take her car to just get a ride to minnesota, i think is laughable. >> they didn't have a cause of death, so how do you point the finger at somebody? >> reporter: the defense didn't produce any witnesses of their own. instead, they aggressively challenged the state's witnesses, like that former girlfriend. the defense tried to show mcvay was more playful than violent.

get him off me, he said he was didn't find it funny? >> yes. right? >> no, he wasn't striking me, he's never struck me. >> reporter: defense attorneys also attacked detective bill thomas, who traced that kid's shovel to a big lots store in wisconsin. >> you have no videos of that transaction, right? >> no. >> you have no receipts with that date, right? >> no, it's paid by cash. >> reporter: the defense confronted justin mueller. police had said he was spotted in the town where carrie's phone last pinged, but he wouldn't admit it. >> you remember being in the milan area at all during that week? >> no. >> his phone records put his phone, at the very least, in milan. another person indicated to the police that he was seen in milan. >> reporter: what do you make of that? >> i think it's a huge hole in the prosecution's case. >> reporter: the defense also challenged the state's evidence -- like the carpet fibers found in carrie's hair

the carpeting in mcvay's house. >> she worked in a carpet store. so just because it happened to be in her hair certainly doesn't indicate anyone intentionally killed anybody. >> reporter: they even challenged the idea that a crime had been committed at all. >> how did she get there? we don't know. how did she die? we don't know. it's one of the biggest mysteries that not even sherlock holmes, i don't think, could solve. >> reporter: tim mcvay declined to take the stand in his own defense, but he maintains that he's a family man who loves his kids, not the violent thug described in court. >> i'm just not that kind of person. >> i couldn't inhale. >> you were accused by cati smiddy though of -- >> well, that was a lie. >> reporter: -- getting violent. >> that was a lie. >> reporter: did you kill carrie? >> i did not. >> reporter: there's a lot of coincidences -- >> there are. >> reporter: -- going on. terrible -- >> there are. >> reporter: -- coincidences for you. >> i agree, yeah. >> reporter: what do you say to those people watching who just maybe don't believe you right now? >> all i can say is what i know. i know that i did not kill carrie.

wonderful friend, a lover, a she was -- she meant the world to me. >> it's been the end of a long trial. >> reporter: after more than two weeks of testimony and argument, his verdict. >> timothy mcvay, i'm finding you guilty of count one murder, count two concealment of a homicidal death. >> i jumped out of my seat. i was so excited and happy. >> reporter: tim mcvay was stoic, showing no emotion. and three months later, he was just as stoic when the judge sentenced him to 45 years in prison. >> i believe you killed her. and the saddest part is, you killed her for a car and some money. >> reporter: for justin mueller, the cloud of suspicion finally lifted. for carrie's family and friends, the verdict meant justice and bittersweet relief.

started crying. and it felt just like this huge weight was gone. >> reporter: but justice for carrie still couldn't explain the why. >> if it was over a ride to minnesota, a car, and money, it's not a very good why. >> reporter: what will you miss most about carrie? >> what i ultimately miss is she's not there, pulling in that driveway, honking, you know, announcing that she's here. she had a heart of gold. she was there for everybody. >> she had a lot of hope for her future. she had everything to live for.

thanks for joining us. loathing on the campaign trail. the republican establishment takes a deep breath and decides to stand with trump. >> i could stand in the middle of fifth avenue and shoot somebody and not lose any voters. it's incredible. >> while insurgents start to back ted cruz. >> the washington establishment knows who's willing to keep the gravy train going. >> donald trump joins me this morning. plus, now it's the democrats' turn to worry and sanders surges. >> we are doing far, far, far better than hillary clinton against donald trump and the other republican candidates. >> their establishment frets over nominating a socialist and wonder what is wrong with hillary clinton. >> i'm not interested in ideas that sound good on paper but will never make in the the real world. >> both hillary clinton and bernie sanders are with this morning.

campaign could not get any more unpredictable, look who's considering jumping in, former new york city mayor michael bloomberg. joining us are nbc's kristen welker, also from nbc kasie hunt and david brooks of the "new york times." trump versus cruz, clinton versus sanders, eight days to iowa. welcome to sunday, it's "meet the press." we've dug out so good sunday morning and welcome to the blizzard edition of "meet the press." with one week to go to iowa, both parties are in a bit of a panic mode. the republicans are fractured. with the establishment thinking the unthinkable. the best way to stop ted cruz might be to back -- donald trump. mr. trump will join me on that issue. but we'll start with the democrats where a more traditional split has developed, think carter/kennedy, gore/bradlee, even