LOS ANGELES • Actress Carrie Fisher of Star Wars fame died from sleep apnoea and "other undetermined factors", the Los Angeles County coroner's office has said.

The brief statement, issued last Friday, also cited conditions of drug use and atherosclerotic heart disease, a build-up of plaque in the artery walls.

Under "how injury occurred", the report noted the intake of multiple drugs, the significance of which remained unclear, it said. The office said the manner of death would be listed as undetermined.

The actress - who catapulted to worldwide stardom as Princess Leia in the original Star Wars trilogy - suffered a medical emergency during a transatlantic flight on Dec 23 last year. She died four days later at the age of 60.

In January, the LA coroner listed the cause of death as cardiac arrest.

Ms Fisher had suffered from numerous addictions and was searingly honest about her bipolar disorder and prescription drug use.

The actress' mother Debbie Reynolds, who won hearts as a star of Singin' In The Rain, died the day after Ms Fisher.

In a statement to People magazine, Ms Fisher's daughter Billie Lourd connected her mother's death to drugs. "My mum battled drug addiction and mental illness her entire life," Ms Lourd said.

"She ultimately died of it. She was purposefully open in all of her work about the social stigmas surrounding these diseases."

AGENCE FRANCE-PRESSE