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 guy was behind bars, pointing to 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 but how could he explain the seemingly damning

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 minutut from where he parked her car at his girlfriend's house. d the prosecution had the test 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? her head must've been on tim mcvay's floor at the time ofer death. >> reporter: the prosecutors also used mcmcy'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 conaled her body in hastings. so2he started accessing the hastings "star-gazette" in january, wanting to kn 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 a`swer any questions about that. >> r

>>eporr: iwas immy o's ere carrieetim mcvay. fr the moment they laid eyes on each other, they were smitten. thewere flirtwith each other. you cotell that they were bothnterested. it's cute. >> ror t studied theology aaugustana colle. he pnncong a mist he st too yog and perid lip to t ribil hto drac u-turn aa ryifrentng bars and clubs as thearaoke f e ad cits. >> he s ve good at runng karaoke. wasunny. hentined theustomers. he got out there and dand with 'em. he woulding songs. 's a good guy. but dn'seem to matter theyere having f. and carrieould imagine future together. >> sheaw everyonaround her getting rried and having ildrenmyself incded. and i she wanted that. >> reporter: but tim wasn't terested in hang more children and tt was al breafor carrie so they deded to go their separate ways. carrie soon started dating justin mueller, an iraq war t, th a very different persity from the gregaris, fun-loving t.>> he seemedery quiet. plea. he wasite. he w nic heeemed litt awkrd. >> reporter: despite his qet and awkward meanor, stin l

. >> reporter: putting the story together was now the job of lead investigators bruce mcvay and everett stahl. tell me a little bit about the building where this takes place. >> thermo fisher scientific is a company that ships medical supplies. kind of like an amazon for medical supplies. it's a large warehouse. >> reporter: how large? try the size of four football fields. for an investigator searching for clues. but on the plus side, the wae was also a secure facility. detectives say it's pretty hard to get inside if you're not an employee. so you know that your suspect is one of those people in the building? >> that's right. >> reporter: the sheriff's department put thermo fisher on lockdown. no one allowed in or out. deputies took a head count. there were 13 workers on site. detectives began interviewing them one by one. >> i'm sitting actually closer than you and i are sitting to the people that i'm interviewing. and i can see with each person i talk to, there's no blood, there's no evidence that they have been involved in anything. >> reporter: if it's one of these people you're in

>> no, he did not. >> reporter: mcvay says it was only in dooley's second interview at his apartment that he first mentioned leaving work and going home. >> and i came back here. >> okay. what time did you come back here? >> 6:30. i couldn't get hold of my wife. i came home to make sure she was okay. >> reporter: but detective stahl says dooley's wife janet told stahl something different. >> i ask her specifically if dave ever came home that morning, and she says no. >> reporter: in a later set of his and hers interviews, janet did say david did come home to change a pair of ripped pants. >> he had to come home and, you know, just grab a pair of pants. >> reporter: it sounds like an alibi. except david dooley adamantly denied doing that. >> i never said that. >> okay. you didn't rip your pants? >> reporter: however, jurors heard that a warehouse co-worker also remembered dooley talking to him the morning of the murder about ripped pants. >> he had a conversation in which he said that he had to go home and change his clothes because he had ripped his pants. >> reporter: while the pros

with every person that has come to a '9er game. narrator: which is why, after super bowl xix, john mcvay was surprised at what was forgotten in the 49ers locker room at stanford stadium. john: i was just sort of milling around and seeing if there's anything left in the locker room, and there was the super bowl trophy. and the janitor says, "what do you wanna do with this?" i said, "i'll take it." so, i got the--here, the game is over, and i got the super bowl trophy. so, i wrap it up in a towel, and take it out, and put it in my trunk, and take it home. in all the hoopla, and now the symbol, it sits there all by itself, lonely self, but i took it home. male: did you think about just kinda keeping it on the shelf? john: no. no. i had to immediately find eddie debartolo and put it in his hands. ronnie: hey, it's a smart thought, 'cause just knowing what i know and knowing mr. d, he would've found it quickly. he he he, he he he. oh, smart move by john. smart move. narrator: super bowl celebrations don't stop in the locker room. they extend to the faithful and to the nation who helped will t