Prince died of a drug overdose, according to law enforcement

A law-enforcement official says tests show Prince died of an opioid overdose, according to the Associated Press.

The musician was found dead in his home in Minnesota on April 21, at the age of 57.

It was previously reported that the drug, a painkiller, was found in Prince's system as well as on him.

No official cause of death has yet been given, however. The Associated Press says its source is "close to the investigation" but spoke anonymously because he wasn't authorized to talk to media.