>> diners. >> there was very little evidence against carl carlson. needed cindy to get him to repeat what she complained claimed was his confession. but carl was suspicious. >> part of me feels like i'm walking into a booby trap. >> well, i can imagine you would feel that way. i had to convince him that, you know, it wasn't a trap. i offered for him to check my purse. and then she got him back to the subject of that day in 2008. >> i asked you if you push the truck and you said yes. >> i didn't push the truck, i said. no, i had nothing to do with it. but i asked and said i took advantage of the situation once it happened. >> carl, you told me, that why you didn't set it up that way, but when you are in the, you saw the opportunity. >> no, after it happened, i panicked and saw the opportunity. >> reporter: the detective was struck by that exchange. how could a father called this an opportunity? >> i understood then, this is someone who doesn't think like wheat do. >> reporter: but this exchange was no confession and the evidence so far was circumstanti