A Los Angeles county coroner's report released Thursday found in his system cocaine, Xanax, Valium, Wellbutrin, Celexa, Digoxin, Chlorpheniramine and Vicodin and crystal methamphetamine.
Because none of the drugs were found in lethal quantities, James' death has been ruled "accidental."
E! Online has reported a few days before his death James, 56, was seen at a Hollywood party using cocaine, and many of his friends privately were concerned that the former "Superfreak" was back to his partying ways.
The "Give It to Me Baby" singer and Grammy winner sold millions of records in the 1980s and is widely credited with saving Motown Records from bankruptcy with hit albums like 1981's "Street Songs."