The Los Angeles County Department of Medical Examiner-Coroner said Monday that Mac Miller died of an overdose of fentanyl, cocaine, and alcohol.
The cause of death was revealed in a statement to People, who added that officials ruled the death accidental and also attributed it to "mixed drug toxicity."
Miller was found unresponsive in his Studio City home Sept. 7.
In addition to other synthetic opioids, fentanyl is sometimes cut into cocaine, heroin, meth, and benzos. The unpredictable nature of that combination, as well as the inconsistent formula used across many regions, can cause dangerous consequences for both new and experienced users alike.