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we are agonizing for these last two years. he was panicked, that turned into torment. i was concerned, she was hurt somewhere. i felt so helpless. >> kelly was always there for others. >> she liked to help people who needed help. >> there are, for her friends, for her country, -- >> this was a good fit for, her the army? >> she wanted to be an officer. >> her personal life was a little more complicated. d. >> were they talking divorce? >> kelli was. mike wasn't. >> had a new boyfriend. >> she was pretty fun. she's easy to talk to. >> and lately, she seemed to have an admirer. >> did ...

was estranged from her husband. >> were they talking divorce? >> kelli was. mike wasn't. >> had a new boyfriend. >> she was pretty fun. she's easy to talk to. >> and lately, she seemed to have an admirer. >> did he ask kelli for her phone number? >> yes. >> when she suddenly vanished, hundreds joined the search, including this perfect stranger. >> i said, i'd like to see if i could solve this. >> he was suspicious about one of the men in kelli's life. >> it is like, dude, i can tell you're lying. >> but getting the truth wouldn't be easy. >> i had to get into his mind, see what he wa...

Provided answers about kelli who had now been missing some 18 months. by this point marshburn spent some $40,000 trying to crack holbert. and thousands of hours. he was losing hope and considered quitting or even trying something drastic. >> at times i wanted to just take nick and cut his fingers off and say, you tell me or i'm going to chop another one off. i wanted to torture him because i knew he knew. >> you really would have done that? >> oh, yeah. i hated him that bad, i despised him. >> marshburn didn't resort to torture but he needed a new tactic, something that would make holbert fina...

Investigator david marshburn had befriended nick holbert, the prime suspect in kelli's disappearance. marshburn was working practically 24/7 to get a confession. chasing every clue holbert dropped. >> we go talk to him and then we'd go out and try and figure it out. we knew we were going on wild goose chases. we had to do it. i mean what else you got? >> marshburn needed to turn up the heat on holbert and had an idea. >> nick was always worried law enforcement was watching him. >> that was his achilles heel? >> uh-huh. so i knew it was a weakness. >> which marshburn exploited by enlisting a fr...

Locked up on that parole violation. if holbert was happy, david marshburn was thrilled because now he could deal with him face-to-face. so just a day after his release marshburn pulled up to the house where holbert was staying. >> i'dve never talked to a killer. have you? >> i work for "dateline. " >> oh, yeah. i take that back. >> what were you nervous about, that he would try to hurt you or just that the stakes are high here? >> sort of like a star struck, you know what i mean? you're like, wow, it is happening. >> marshburn took a deep breath and knocked on the door. >> and he answered the ...