Diane Keaton‘s cause of death is now public. A source says that the family confirmed pneumonia as the reason. The Oscar-winning star died on October 11, 2025, aged 79. The update follows an initial ask for privacy as relatives processed the loss.

The Oscar winner’s family told People magazine that she died from pneumonia on Oct. 11. “The Keaton family are very grateful for the extraordinary messages of love and support they have received these past few days on behalf of their beloved Diane, who passed away from pneumonia on October 11,” they wrote in a statement.

Diane Keaton’s family has revealed that the Oscar-winning actress died from pneumonia following a sudden health decline.