The rapper was 26 years old.
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The LA Country Coroner's Office has released its report confirming US rapper Mac Miller's cause of death.
As TMZ reports, Miller aka Malcolm James McCormick, died from an accidental overdose with fentanyl, cocaine and alcohol found in his system.
Miller’s label, Warner Music, confirmed the death in September via Twitter, while TMZ reported the artist was found in his San Fernando Valley home by a friend.
The news follows Miller’s ongoing struggles with substance abuse. The rapper had crashed his car into a utility pole and been arrested for driving under the influence back in May.
Miller’s last album, Swimming, was released in August.
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Earlier in the year The Music's Jessica Dale investigated just how deadly fentanyl can be. Read the feature here to find out more.