>> to have your own prints in your own house is not that significant, but given the fact that we have this story about what happens and the door is really clean otherwise, it's just one more piece to the puzzle. >> investigators found shards of glass in the hallway outside the bedroom, leading towards the bathroom. it was easy to see it was from the killer. >> there's some trace evidence, some transfer blood and tissue to a wall right next to the door that exits the bedroom. and that's significant. >> we followed the glass shards to the bathroom and then inside the bathroom, we found an additional glass shard, and then we found two black hairs in the sink area. >> all of the hairs from that bathroom were sent to the forensic lab for analysis. >> these hairs had a very dense pigmentation pattern. they contained overall characteristics of what one