A toxicology report from Prince’s autopsy showed last month that the singer, 57, whose full name was Prince Rogers Nelson, had concentrations of the opioid painkiller fentanyl in his body that experts called “exceedingly high.” The official cause of death was ruled to be a self-administered overdose.

Search warrants last year revealed that prescription drugs were found all over Prince’s house, some of them in the name of a confidant who claimed that he hadn’t known that Prince was addicted to pain pills. The documents didn’t indicate whether investigators had pinpointed the source of the fentanyl, and no one has been charged with a crime.

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