Autopsy showed morphine overdose killed Slipknot bassist
Gray, 38, was found dead by staff at a hotel near Des Moines, Iowa on May 24, said Sgt. Dave Disney of the Urbandale Police Department.
Toxicology test results showed a fatal level of morphine and fentanyl — a synthetic morphine — in Gray’s body, said Dr. Gregory Schmunk.
Schmunk also noted the presence of significant heart disease, according to a police statement Monday.