Article continues below advertisementDiane Keaton's death was confirmed by a spokesperson for her family on Saturday, October 11. The First Wives Club actress is said to have died in her home state of California.The cause of death has not yet been revealed; however, a source close to the legendary actress shared with a news outlet that her health rapidly declined in the months leading up to her passing.Article continues below advertisement'It Was So Unexpected'Source: megaA family friend revealed Diane Keaton's health 'declined very suddenly.