Dr. Dre’s son, Andre Young Jr., died from an overdose of heroin and morphine, the Los Angeles County Department of Coroner confirmed to People magazine.
“This case has been closed, it’s been ruled an accident due to morphine and heroin intoxication,” coroner spokesman Larry Dietz told the magazine. The drug test results had been pending for four months.

Young, 20, was found unresponsive by his mother, Jenita Porter, 40, in their Woodland Hills, Calif., home on the morning of Aug. 23.

“Dr. Dre is mourning the loss of his son,” the rapper’s publicist Lori Earl previously said in a statement. “Please respect his family’s grief and privacy at this time.”