Autopsy results for Kris Kross rapper Chris Kelly were released on Monday. Kelly, 34, was found dead on May 1, 2013. The official cause of death: a drug overdose.

From Rolling Stone: 

Betty Honey of the Fulton County Medical Examiner's office in Atlanta said the specific drugs involved in the rapper's death were unknown, but Kelly's mother told investigators of her son's history of drug abuse, and said that he had used cocaine and heroin the night before his death.

Read more at Rolling Stone.