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? >> 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