>> it was, he said, a small circle. mostly family. >> i had an eyewitness who put dina shacknai at the scene of the murder that evening. >> dina, the grief stricken mom. could she have blamed rebecca and then sought revenge? remember, mary recalled her sister saying, dina is going to kill me. where were you when rebecca zahau died? >> i don't know when she died, but i was in the hospital all night. >> in 2013, keefe greer filed a civil wrongful death suit on behalf of the zahau family. based on his eyewitness he named dina as a defendant along with her twin sister nina. there was also third defendant, the man who called 9-1-1, jonah's brother, adam shacknai. did you have anything to do with rebecca's death? >> absolutely not. >> greer disagreed.