he was searching. >> reporter: so larry montgomery turned his attention to chris mcamis. or innocent? chris was the last person known to be with lynsie. he told police he drove straight home after dropping lynsie off. and police found that photo of what looked like his truck heading north away from lynsie's neighborhood, which took him past this atm camera. the video from the atm camera, police at the time saw that as not iron clad proof that chris was telling the truth, but suggestive that what he said he actually did. >> correct. >> reporter: but when larry compared photos of chris' truck with the photos from the bank, he saw something no one else had noticed. the paint on the back of the side view mirror on chris' truck was white. what about the truck in the photo? >> the truck in the photo had a dark spot in that area, which means whatever mirrors were there, if mirrors were there, they were black. >> reporter: not the same truck? >> that's right, it is not. >> reporter: suddenly chris' alibi had a big hole in it. larry moved on to chris' history with women. two ex-gi

. >> then in came the last person known to have seen her, chris mcamis, 21 years old, out of school.e told the cops he was unemployed. lynsie had met him through friends four months prior and it turned out he never drove lynsie to andrea's house for a sleepover. chris said that was a lie she made to tell her mother. the real story was to go clubbing all night in san diego. >> don't tell my mom we're going clubbing in san diego. definitely don't tell her that we're clubbing. >> chris told police that when their night of clubbing went bust, they headed home earlier than expected. he dropped off the other girls, he said, and then headed to lynsie's house. >> chris said it was after 4:00 a.m. when he finally got back here to lynsie's neighborhood. he said lynsie was worried about her mom might hear his truck pull up at that hour. chris said she asked to be dropped off at the corner. about 50 yards away. that sounded strange to police until they heard from lynsie's friends that at other times she had asked to be dropped off right here. chris said he then drove home and police even found a