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Ryan Reavis, 39, pleaded guilty last November to distribution of fentanyl, a synthetic opioid that is up to 50 times more powerful than heroin.
Reavis provided the counterfeit oxycodone pills, which he knew were laced with fentanyl or another controlled substance, to Cameron Pettit at the direction of Stephen Walter on Sept. 4, 2018, according to prosecutors.
Pettit sold the fentanyl-laced pills to Mac Miller the next day and the Grammy-nominated artist was found dead in his Los Angeles apartment on Sept. 7.
Walter also pleaded guilty to distribution of fentanyl last year, while the case against Pettit is pending, Fox 11 Los Angeles reports.
Mac Miller, whose real name was Malcolm James Myers McCormick, had alcohol, cocaine, and fentanyl in his system when he died.