didn't have any evidence to arrest holbert for kelli's disappearance, but he did discover holbert wasting the terms of his parole. >> he was a prior sex offender, and he was not registered properly, and he was placed in jail. >> sex offender nicholas -- >> right where detectives wanted him. now they could watch holbert, see if he blabbed to a cell mate about what happened to kelli. they also questioned him twice, even took him back to froggy bottoms to jog his memory, but holbert stuck to his same, though sometimes inconsistent story. >> you caught him in lies but you couldn't crack him? >> exactly. >> by now olivia and matt had left fayetteville and gone home. >> you must have felt kind of like you were leaving your sister behind even though realistically you can't stay forever. >> i remember feeling defeated. we came up here thinking that something was going to happen and it didn't. >> i don't know. i felt like i didn't sleep for a couple of weeks. it was 24/7 thinking about what happened, what happened, what happened. >> detectives and the d.a. seemed so close to an answer, they ev

now he was fully convinced nick holbert had killed kelli, but he needed to get holbert to reveal where her body. >> how can i be his friend? and i had to do some things, say some crap that i just didn't believe, but i had to do it to play the part. >> marshburn bought holbert countless meals, beers, even hired him to do odd jobs, slowly becoming a bff, or maybe a more of a fren-enemy. but marshburn said he paid a high price as he practically abandoned his wife and young son. yin yints. >> i didn't do any family stuff. >> if we were eating somewhere, and nick called and said i need cigarettes, i need some money, i would get up and do what i had to do and come back. >> were you obsessed? >> when i have somebody i'm hunting down i don't stop until i get them. >> isn't that being obsessed? >> i don't know. when i'm hunting someone down i don't stop until i get the answers i need. >> 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 l holbert. he was losin