at times on video and sometimes just on audio tape. >> when is the last time you saw lynsie? >> a week ago. >> no. i don't think so. >> absolutely. >> no. absolutely not. >> marty said that he had last seen lynsie the day that she went to san diego on that friday. >> reporter: did you believe him? >> we really didn't believe him. >> reporter: they didn't believe him because a clerk at a local clothing store had called to say she had seen lynsie with a much older man who matched marty's description together at her story after the day lynsie went missing. >> i flat wasn't there on that day, okay? i have been in that store, all right? i said, i'm like you, i'm easily, you know, identified, okay? probably every place i've been with her would know that i was in there with her, okay? >> it was a very long, very long interview. >> reporter: friendly? >> no. no. i remember drilling down on him,