An Iowa doctor who supplied Slipknot bassist Paul Gray with prescription painkillers has been charged with eight count of manslaughter.

Gray, who struggled for years with addiction, was found dead in a hotel room in Des Moines in May 2010. The 38-year-old musician was the victim of an overdose of morphine and fentanyl (a morphine substitute). Paul Gray founded Slipknot in 1995; the heavy metal band was known for wearing masks while performing.

Daniel Baldi, a 50-year-old doctor who helped run a pain clinic in Des Moines, could face up to 16 years in prison if found guilty. He began writing high dosage prescriptions for narcotic painkillers for Gray in 2005, despite knowing that the musician was struggling with drug addiction. The doctor pleaded not guilty to the manslaughter charges related to the overdose death of Gray and seven other patients.…