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Enlisting a friend who owned a vehicle that looked like an unmarked police car. he had him park near holbert's house and conduct surveillance, fake surveillance. >> it worked like a charm because he saw him right out the gate when he come outside and got paranoid. >> so paranoid that marshburn tried yet another trick to push holbert to give it up. he had his wife pose as a paralegal and drop phony indictment papers charging holbert with kelli's murder. >> i took one of his old charges, changed who the detective was, changed the charges. he was being indicted and i got cc, my paralegal person o...

Released from jail after being locked up from that parole violation. if holbert was happy, david marshburn was thrilled, because now he could deal with him face to face. just a day after his release, marshburn holed up at the house where holbert was staying. i've never talked to a killer. have you? >> i work for "dateline." >> were you worried he would kill you? >> i didn't fear him because i don't fear anybody. nobody is big or gad enough, it's the man upstairs i'm worried about. >> so it's more like, i want to get this right, i want to solve this. >> and if you do one thing wrong, it turns t...

Just like slams on the brakes, in your life you can't do anything. i honestly didn't think we would ever find her. >> really? >> what was going to change? >> but little did justin know things were about to change. up in fayetteville, private 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? >> m...

Abandoned his wife and young son. >> i didn't do family stuff. if nick called me and said, hey, i need cigarettes, i need money, i would get up and leave, get to him and do what i had to do and come back. >> were you obsessed? >> when i have an answer, i don't give up. i wanted to be the one to find the answer. marcia, my partner, she's the same way. we don't stop until we get results. >> but holbert still wasn't providing any answers about kelli, who had now been missing some 18 months. by this time, marshburn had spent thousands of hours and some $40,000 trying to crack holbert. he was losin...

>> reporter: so paranoid that marshburn tried, yet another trick to push holbert to give it up. he had his wife pose as a paralegal and draw up phony-indictment papers charging holbert with kelli's murder. >> i took one of his old charges. changed who the detective was. changed the charges. he was being indicted and i got cici, my paralegal person on the phone. >> who is your wife? >> yeah, who's helping me. the plan was working good. and he was worried. >> reporter: holbert took one look at the indictment papers, and went into a panic. sensing nick was near his breaking point, marshburn remin...