and rebecca zahau's hanging a suicide. but neither max's mom nor rebecca's sister were convinced. to make an explosive accusation. continuing with our story, here is josh mankiewicz with "the mansion on ocean boulevard". >> the official investigation was over. the crime scene tape and evidence marker long gone. that said, an unofficial search for clues was just beginning. online message boards buzzed with theories from the far fetched to the implausible. through it all, rebecca's sister mary didn't buy the official finding of suicide. was she fragile? was she easily upset? is she the kind of person who would fall apart after a crisis? >> not at all. >> so when detectives said that voice mail, the one jonah left for rebecca with the grim news about max, may have caused rebecca to hang herself, mary wasn't having it. >> i was not about to have my sister's name smeared, and the world remember her as this crazy woman who committed her suicide because of a phone call. >> was all this just about how rebecca would be remembered? after her death came some revelations, things even mary had