guy named matty. did you know a marty? >> no. >> he said he had gone to pick up lindsay at school and she wasn't there. he said he had money of lindsay's she needed for tuition. none of that made sense to nancy. >> after lindsay goes missing, her mother gets a phone call from marty. >> marty rossler. >> what does he say to her? >> he says he has befriend lindsay's, he's a friend of lindsay's and he's concerned because he hadn't heard from her. >> what had you heard about marty rossler? >>s watt not marty rossler. >> he had a relationship with lindsay he didn't tell his wife about. he told police he would pick lindsay up and give her rides but that was about it. marty was 58. >> and she was 20? >> and she was 20. >> and they were boyfriend and girlfriend? >> don't think so.