the unlikely intruder, the parkers' family friend bryan capnerhurst. wife tammy in a botched robbery attempt then brett in fear for his own life killed his friend. it looked like self-defense. but sheriff leon lott knew they couldn't close the case without thoroughly checking out brett's story. >> there's three people there. two of them are dead so we have to rely on him to explain to us what happened. so we were listening to everything that he was saying. and then we'd go back and check it. >> investigators went over brett's account starting with the moment bryan entered the house. before long, something unusual came to their attention. brett told police he was sitting on the downstairs toilet when he heard the shots ring out. but one of the female crime scene investigators noted this, the toilet seat was up. >> our lieutenant is a female and she made mention of that, that particularly bothered her. >> of course, it takes a woman to notice that. >> right. >> as they pored over crime scene photos another small but important detail jumped out, bryan's g