Slipknot bassist Paul Gray reportedly died of an accidental overdose of morphine and the narcotic fentanyl, his autopsy has revealed.

Officials have also claimed that when the rocker’s body was found – by a maintenance worker in a hotel – ‘all kinds of pills’ lay around his body, with a hypodermic needle also lying near the bed he was on.

Gray did not have prescriptions for the drugs, and police are investigating where the 38-year-old musician might have got them from, according to reports.

Gray – a founding member of the quirky heavy metal band – was found dead in TownePlace Suites in Urbandale, Iowa, on 24 May. His wife Brenna is pregnant with their child.

Polk County Medical Examiner Dr Gregory Schmunk said this week that morphine and fentanyl, both of which were injected, were the cause of his death, but that the pills were not a factor. He did not reveal what the pills were.

Gray (pictured) also suffered from significant heart disease at the time of his death, Dr Schmunk said.

Police say there were no reasons to believe he was suicidal.

‘We feel very comfortable that this was more than likely an accident,’ said Sergeant Dave Disney.

Gray had reportedly battled with drugs in the past, including a 2003 arrest in Slipknot’s native Iowa for possession of cocaine, marijuana and drug paraphernalia following a car accident.

Another one who’s life had ended short due to highly addictive opiates. This is why I quit and why you should too.

Paul Dedrick Gray of Slipknot, Accidental Overdose

Paul Gray Police Mugshot