By Lynette Rice
Updated December 20, 2019 at 11:11 AM EST

An autopsy report released today reveals that Natasha Richardson died of a head injury after her fall on March 16 at a ski resort in Canada, the AP reports. The incident was ruled an accident. The 45-year-old film and stage star reportedly complained of a headache shortly after she left a ski lesson at the Mont Tremblant resort, where officials said this week that she “did not show any visible signs of injury.”

A publicist for Richardson’s husband, Liam Neeson, confirmed her death Wednesday.

UPDATE: The New York Times is reporting that Natasha Richardson wasn’t taken to the hospital until nearly four hours after her skiing accident. That makes for a major discrepancy with the resort’s claims that only an hour passed before the actress was hospitalized. The Times bases this new time frame on records obtained from the ambulance dispatcher. According to a series of medical experts interviewed for the story, had Richardson gotten immediate medical care for this type of brain hematoma, her chances for survival would have been greatly improved.