Chris Kelly of Kris Kross performs on stage at the Fox Theatre in Atlanta during the So So Def 20th Anniversary Concert on February 13.

Chris Kelly of rap duo Kris Kross has mixed drugs before. Photo: AP

A medical examiner's investigator says Chris Kelly of the '90s rap duo Kris Kross died of a drug overdose.

Investigator Betty Honey of the Fulton County Medical Examiner's office in Atlanta said Monday that a toxicology screening showed the 34-year-old Kelly had a mixture of drugs in his system when he was pronounced dead on May 1. However, Honey said she did not know which specific drugs Kelly had used.

A police report says Kelly's mother told investigators her son used cocaine and heroin the night before he died and had a history of drug abuse.

Kelly, known as "Mac Daddy", performed alongside Chris Smith, known as "Daddy Mac", in the early and mid-1990s. The duo was remembered for the song Jump from their 1992 debut album, Totally Krossed Out.

AP