Real estate mogul Robert Durst says he โ€˜killed them allโ€™ [VIDEO]

New York real estate mogul Robert Durst, who was arrested over the weekend on murder charges, said in an unguarded moment caught on microphone during filming of HBOโ€™s โ€œThe Jinxโ€ that he โ€œkilled them all, of course.โ€