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>> tara has no law enforcement background. she calls herself an intelligence analyst. she and dina have floated several theories over the years. the current theory? whoever killed max, it was not rebecca zahau. these days their suspicion is focused on information from a neighbor that's never been verified. the story of a wild party at the mansion the night before max's fall. >> he has not been interviewed by the police and he has not come forward. >> but what connection it might have to max's death you have no idea what that is? >> i don't. but i think it should be explored. >> reporter: she s...

Intelligence analyst. she and dina have floated several theories over the years. the current theory -- whoever killed max, it was not rebecca zahau. these days their suspicion is focused on information from a neighbor that's never been verified. a story of a wild party at the mansion the night before max's fall. >> he has not been interviewed by the police and he has not come forward. >> reporter: but what connection it might have to max's death, you have no idea what that is. >> i don't. but i think it should be explored. >> reporter: she said police never spoke with the neighbor. but we did....