WorldRobert Kennedy Jr’s estranged wife Mary Kennedy died of hanging: autopsyKatrina JonesMay 18, 2012May 18, 2012 by Katrina JonesMay 18, 2012May 18, 2012 New York: A medical examiner after an autopsy said on Thursday Mary Richardson Kennedy, the estranged wife of Robert F. Kennedy Jr., died of asphyxiation...