Kris Kross rapper Chris "Mac Daddy" Kelly died of drug overdose, a medical examiner revealed. Kelly, who died last May 1, was found unresponsive on a couch in his living room in Atlanta. The toxicology screening showed that he had a combination of drugs in his system at the time of his death,. His mother disclosed that he had cocaine and heroine the night prior to his death. The Medical Examiner's office in Atlanta, however said that the specific drugs involved with Kelly's death were unknown.