American rapper Mac Miller was found dead in his California home on Friday.
The 26-year-old whose real name was Malcolm James McCormick rose to fame after topping US charts with his debut album in 2011.
"The music artist known as Mac Miller died today in his Studio City home," the LA County Department of Medical Examiner-Coroner said in a statement.
"In the late morning of September 7, Malcolm McCormick was found unresponsive.... authorities were called and Miller was pronounced dead at the scene at 11:51 (18:51 GMT).
"At this time, an autopsy is pending and a cause of death has not been determined."
Miller had earlier opened up about substance abuse in interviews and some of his lyrics. He earlier dated singer Ariana Grande. The couple broke up in May this year and Grande called the relationship 'toxic'. In a note published on social media after the breakup, Grande wrote that she had "cared for him and tried to support his sobriety & prayed for his balance for years."
Miller was scheduled to launch a US tour next month, and had tweeted about it on Thursday. "I wish it started tomorrow."