Star Wars actress Carrie Fisher's death was triggered by sleep apnoea and various "other factors" but an exact cause could not be determined, a coroner has said.
Fisher, 60, went into cardiac arrest while on a flight to London to Los Angeles on December 23.
Fisher, daughter of actor Debbie Reynolds and late singer Eddie Fisher, was best known for her role as Princess Leia in the Star Wars franchise.
Fisher had a buildup of fat in the walls of her arteries, Los Angeles coroner's officials said in a news release.
The actress had long spoken about her battles with drug addiction and mental illness, becoming a particularly prominent voice for those who are bipolar.
Mr Fisher said his sister had written a lot about her drug use and that numerous things she took had been prescribed by doctors for her mental health conditions.
Additional autopsy and toxicology details were not available.
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He said his family did not want a coroner's investigation into his sister's death.
The actresses were laid to rest together at Forest Lawn-Hollywood Hills, a cemetery where numerous celebrities are buried.
Fisher's brother Todd Fisher asserted that he was not surprised by the results, and mused that Carrie's heart condition may well have been exacerbated by her smoking habit, as well as the medications she was on.
It also said: "How Injury Occurred: Multiple drug intake, significance not ascertained". Let's celebrate not doing them by doing them.' I got into trouble each time.
On work front, Fisher will be seen in, yet to be released, 'Star Wars: Episode VIII - The Last Jedi'.
Fisher made her feature film debut opposite Warren Beatty in the 1975 hit Shampoo.
