According to the autopsy report, Prince died of an overdose of Fentanyl which is a synthetic opioid pain medication with a rapid onset and short duration of action. The drug was self-administered.
According to the dealer Prince used to get drugs from, the latter would spend up to $40,000 on 6 months drug supplies of Dilaudid pills and Fentanyl patches.
Investigators didn't find prescriptions for the drug Prince had taken and thus it's believed that the drug was self-administered.
Prince was using drugs to handle stage fright. It was revealed that the singer had an addiction to Percocet decades before he died.
Before the incident, Prince was in bad health and had to postpone some of his performances. On April 15th, he became unresponsive while flying to Minneapolis and his private jet had to make an emergency landing to save him.
According to the report, there were no signs of suicide or foul play. His death at the age of 57 is now believed to be accidental. See also why people use addictive drugs.
Andrew Kornfeld called 911 right after finding Prince unresponsive at his Minnesota home. When the doctors arrived, they realized he had been dead 6 hours earlier.
Prince was found unresponsive in an elevator at Paisley Park.