>> reporter: the official investigation was over. the crime scene tape and evidence markers long gone. that said, an unofficial search for clues was just beginning. online message boards buzzed with theories from the farfetched 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 that would fall apart after a crisis? >> not at all. >> reporter: so when detectives said that voicemail, the one jonah shacknai 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. >> reporter: was all this just about how rebecca would be remembered? after her death came some