because the atm photo that at first fooled investigators actually proved chris wasn t there. it wasn t your truck. but for years, it was thought that it was your truck. it s not. as a matter of fact your truck did not go by that night. it wasn t there. reporter: he told chris about the credit card statement and how he found someone who remembered chris working on the job site. all of a sudden, big red flags. you are working. you re out there when you said you were not. but he said you guys don t work on saturday. lynsie disappeared on a saturday morning. none of your credit card usage up there is on it, any weekend. all of it is on weekdays except for the day lynsie disappeared. reporter: he told chris the lie about lynsie being found. we went recently, found dna and had that checked against the body and it s lynsie.
reporter: she introduces you to this guy chris. did he say hello? mm-hmm. reporter: did he have good manners? mm-hmm. reporter: but nancy said something was wrong. it was a struggle to let go, but she did. the last thing i said to her was, remember your seatbelt. she looked over her shoulder and said, back at you, mom, love you. reporter: nancy locked up the house and went to bed. lynsie was supposed to call but when the call never came, nancy found out that lynsie never showed up at her job. all of a sudden she wasn t where she was supposed to be. she had taught these girls for four months, about. reporter: and you had no way