we interviewed her roommates, boyfriend. everyone is a suspect. and then a man said i kidnapped her, we have her, we ran the criminal history. that s when all the bells went off. he pulls in, asking me to get in the car. i feel the cold blade against my neck. he carries cme to the basement of his home. it was jaw dropping, just chilling. they started digging and they found women s clothing. it was escalating. there were so many victims? yes, there still are. until this guy is in longer in existence. i ll carry this fight. ecome a supreme court justice. ge, hello and welcome to dateline. shannon melindi dreamed big. at 15 she wanted to become a supreme court justice. in college she scored a foundation. detectives had a suspect in their sight, but it would take years. a horrific tail to unravel the mystery of shannon s disappearance. here is dana murphy with shannon s story. reporter: the videos, the document reof her life. reporter: the professional dad
autopsy. his conclusion? homicide. was rebecca murdered? her family thought so. and eventually the case found its way to this man. it was intriguing from the beginning. reporter: san diego attorney keith greer. dr. wecht did identify deep bruising and internal bleeding, which couldn t be explained by the hanging. wait one second, but could be explained by what? somebody knocking her down from behind, and hog-tieing her. a struggle. reporter: plus the force of falling nine feet from the balcony should have caused more severe injuries to rebecca s neck. greer, like dr. wecht, believed someone killed rebecca and placed her body at the end of the rope. and he began to develop a theory as to who. the writing on the door is the key to the case. reporter: remember the message painted on the door? investigators initially declined to reveal what it said.