to turn his testimony against liam. >> preston taylor agreed to cooperate with the state. >> he pleds. preston wishes he had acted differently, preston has cried with me. preston has now tried what he could to try to atone for himself. he knows that whatever he does, he can't bring her back. >> preston, i always thought of him as a story teller. i nevada thought him to be credible, so to see him confessing towards liam, i just didn't -- i didn't believe it. none of it made sense to me. >> i don't have nice to say about preston. >> we sat down and spoke with liam's mom about the case and about watching that chilling video tape, that so-called confession that her son made. >> and it took me a half an hour to kill her. i thought i was gonna be able to choke her out and have her out in like a couple minutes. >> liam doesn't speak about things lightheartedly. that was not liam, to me, describing an actual murder. that's not the tone liam uses when he speaks about something serious. that was an act. >> he was doing an audition. he was making things up, trying to impress that horror film di