dave nemeth: dna profiles were only from rebecca. icz: so what about rebecca's hands and feet being tied? didn't that show another person was involved? sergeant nemeth said it did not. we conducted an experiment to determine if it is possible for a person to secure their hands behind their back in the fashion we found. josh mankiewicz: they even showed a video demonstration. and while tying one's hands in a suicide is uncommon, the medical examiner said it's not unheard of. people do it. the thinking is that they bind themselves, so that they won't change their mind midway through. it's unusual at first glance, but it does happen. josh mankiewicz: the location of the apparent suicide note was also uncommon. dave nemeth: there was a message painted in black paint on the door leading to the room. i am going to show you a picture of the door. we will not be revealing what the message said. josh mankiewicz: the investigation left some people unsatisfied-- none more so than rebecca's family. i know in my heart she did not commit suicide. j