Stone Temple Pilots frontman Scott Weiland, who died on Dec. 3, was killed by a combination of drugs, alcohol and the conditions from which he suffered as a result of his addictions, according to a medical examiner’s report.

The Hennepin County Medical Examiner’s office released a statement Friday stating that Weiland was killed by a “mixed drug toxicity: cocaine, ethanol and methylenedioxyamphetamine (MDA). Other significant conditions are noted as atherosclerotic cardiovascular disease, history of asthma and multi-substance dependence. Manner of death is accident.”

Weiland was found unresponsive on his tour bus in Minnesota, where he and his band The Wildabouts were scheduled to perform at the Medina Ballroom. A funeral for Weiland was held in Los Angeles on Dec. 10.