EMBED >More News Videos Ariana Grande posted a tribute Friday to her ex-boyfriend Mac Miller a week after the hip-hop star's death.

LOS ANGELES (KABC) -- Coroner's officials on Monday released the cause of death of the rapper Mac Miller, who died in September at his home in Studio City.The 26-year-old hip-hop artist, whose real name was Malcolm James McCormick, "died from mixed drug toxicity (fentanyl, cocaine and ethanol)," according to a statement from the Los Angeles County coroner's office.The manner of death was ruled accidental.McCormick was found unresponsive Sept. 7 at his home in the 11600 block of Valleycrest Drive. He was pronounced dead at the scene by emergency responders.The Pittsburgh native was in a two-year relationship with Ariana Grande that ended earlier this year.His music, which often examined his depression and drug use, won him fans among some of the biggest names in hip-hop.Performers at a tribute concert for him last week included Chance the Rapper, Travis Scott and John Mayer.