polygraph, he agreed to that, too. but here's the thing with that last part, the polygraph. >> failed the test. >> that's a bad sign for you, right? >> it's a bad sign for him, yes. didn't tell you that he's guilty, but it -- he was a very strong person of interest. >> and what's more, the detective had been speaking with jamie's friends who said the relationship wasn't fine. in fact, the couple had a fight and were on the verge of a breakup. all of which just led to more questions. >> basically, went over every aspect of the relationship. just questioned him on his whereabouts. tried to get him to confess. >> and if a failed polygraph wasn't suspicious enough, then listen to what the detective says chuck told him next. >> he said he had done some bad things, and wouldn't tell us what. >> did you look him in the eyes and say is one of those bad things killing jamie hart? >> i did. he denied it. at that point in time, i really thought he could be our killer. >> and the more you started to think he was the killer, how