Wife of Robert Kennedy Jr found dead in home hanging herself .

Mary Kennedy with her husband Robert

An autopsy revealed Mary Kennedy’s cause of death was asphyxiation as a result of hanging, medical examiners said Thursday. Kennedy, the estranged wife of Robert Kennedy Jr., was found dead on Wednesday in her Bedford, New York estate. Bedford police said they discovered Kennedy’s body inside an “out building on the property.” Kennedy was the mother of four children from ages 10 to 17, and recently reportedly battled drug and alcohol problems in recent years.