The Los Angeles County coroner’s office on Friday listed the cause of death for “Star Wars” star Carrie Fisher as sleep apnea and other factors including drug use.
The coroner’s office released a short summary of its findings, but officials declined to make any additional comments. The statement said “the manner of death has been ruled undetermined.”
Her death certificate said in January that the 60-year-old, best known for her role as Princess Leia, had suffered a cardiac arrest.
But in a statement the LA coroner said the exact cause was unknown.
Sleep apnea is a common condition in which a person stops breathing during sleep, either for a few seconds or minutes.
As well as listing sleep apnea as a cause of death, the coroner's statement cited other factors, including heart disease and drug use.
Her manner of death would be listed as undetermined, it said.
Fisher, 60, was taken to the hospital by Los Angeles Fire Department paramedics in December after falling ill during her 11-hour flight from London to Los Angeles International Airport.
She never regained consciousness and died on 27 December at the Ronald Reagan UCLA Medical Centre.
Her mother, actress Debbie Reynolds, died the following day.