The official cause of death for Oscar-winning actress Diane Keaton has been confirmed. The star passed away at 79 years old on Saturday, October 11, 2025.
Keaton’s family shared a statement with People on Wednesday, October 15, confirming that she died from pneumonia.
"The Keaton family is so 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," the statement read.
Her family also requested that any donations in Keaton’s memory be made to a local food bank or animal shelter. This tribute reflects her strong support for the homeless community and her love for animals.
A spokesperson initially confirmed Keaton’s passing on October 11, requesting privacy for the family. At that time, no further details were disclosed regarding her death.
A friend of Keaton later informed People that her health had "deteriorated very suddenly" in the months prior to her death. The actress had reportedly withdrawn from public life to spend time with her "closest family."
Keaton was actively attempting to sell her 9,149-square-foot Los Angeles home. She had initially listed the property for $28.9 million before reducing the price by $1.4 million in March 2025.
Her final Instagram post, made in April for National Pet Day, featured her beloved golden retriever, Reggie. The post was a collaboration with home decor company Hudson Grace.
Keaton’s caption read, "Proof our pets have good taste too. Happy National Pet Day from HG and Diane Keaton."
Keaton’s remarkable Hollywood career spanned nearly 60 years. It included her Best Actress Oscar win for the 1977 comedy Annie Hall.
She earned three additional Oscar nominations for her roles in Reds (1981), Marvin’s Room (1996), and Something’s Gotta Give (2003). Her iconic performance as Kay Adams-Corleone in 1972’s The Godfather cemented her place in cinematic history.
Keaton also ventured into directing, helming music videos and television episodes, including a segment of the groundbreaking series Twin Peaks in 1991. She continued to secure leading film roles until shortly before her passing, with her final film, Summer Camp, released in 2024.
Tributes from co-stars began pouring in following her death in October 2025.
Bette Midler, who starred alongside Keaton in The First Wives Club, shared a heartfelt message on Instagram on October 11.
Midler remembered Keaton as "brilliant, beautiful, and extraordinary." She added, "I can’t tell you how unbearably sad this makes me. She was hilarious, completely original, and without any malice or the competitiveness you would expect from a star like her. What you saw was who she was… oh, la, lala!"
Kate Hudson, whose mother Goldie Hawn also starred in The First Wives Club, shared a clip from the classic comedy on Instagram.
Hudson’s caption for the post simply stated, "We love you so much Diane."