>> marty rossler was not marty. >> he did not have a criminal record. what he did have with a relationship with lynsie that he hadn't told his wife about. he told police he'd often pick lynsie up and give her rides but that wasn't it. marty was 58. she was 20? >> she was 20. >> and they were boyfriend and girlfriend? >> don't think so. >> there you go. >> so police brought in marty. over two days, they recorded those interviews. at times on video and sometimes just on audiotape. >> when's the last time you saw lynsie? >> a week ago now. i don't think so. >> absolutely. >> absolutely not. >> marty said that he had last seen lynsie the day that she went to san diego on that friday. >> did you believe him? >> we really didn't believe him. >> they didn't believe him because of a tip they received. a clerk at a local clothing store had called to say she had seen lynsie and a much older man who matched marty's description together at her store after the day lynsie meant missing. >> i had been in that store, okay, i'm like you. i'm easily -- you know, identifi