. >> reporter: san diego attorney keith greer. >> dr.echt did identify some deep bruising and internal bleeding, which couldn't be explained by the hanging. >> reporter: wait one second. it couldn't be explained by the hanging but could be explained by what? >> by somebody knocking her down from behind and hog-tying her. something along those lines. a struggle. a struggle. >> reporter: plus, greer says, 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 then 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 bedroom door? sheriff's investigators initially declined to reveal what it said. greer eventually found out. the message, scrawled in black acrylic paint, read, "she saved him, can you save her?" greer believed the message was not written by rebecca, it was written about her. >> reporter: w