Diane Keaton's family told PEOPLE Wednesday that the Oscar winner died of pneumonia on Oct. 11 at age 79. Keaton's official death certificate was revealed on Thursday, Oct. 16.

The cause of death of Oscar-winning actress Diane Keaton has reportedly been revealed. Keaton, 79, died on Oct. 11 of pneumonia, according to People magazine, which cited a statement from the actress' family, which also expressed thanks for "the extraordinary messages of love and support."

Diane Keaton's death certificate has been released days after she died in Santa Monica at 79 years old on Oct. 11.

Richard Gere is paying tribute to legendary actress Diane Keaton.

Diane Keaton spent several months in Palm Springs and surrounding desert cities prior to her death. One desert attraction was clearly her favorite.

Celebrate the photographic legacy of Diane Keaton. Explore her work, from ‘Reservation’ hotel interiors to the collage-memoir of ‘Saved’.

California nimal rescue, Helen Woodward Animal Center, honored the late Diane Keaton on Tuesday, Oct. 14, for her service as a board member and her work on animal welfare