but given the fact 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, 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 would conclude as being a negroid hair. >> finally, investigators