According to the Westchester County Medical Examiner's Office, the cause of death was asphyxiation due to hanging.
Mary Richardson Kennedy was found dead Wednesday on family property. She was Robert F. Kennedy Jr.'s second wife.
Mary Richardson Kennedy had trouble with drugs and alcohol, and had two high-profile arrests around the time her husband filed for divorce in 2010. The divorce was never finalized.
She pleaded guilty to drunken driving later that year when police reported her seeing her car hit a curb outside a school near her home.