Oscar-winning actress Diane Keaton’s shocking cause of death has come to light after her family’s tragic announcement.Diane Keaton left all loved ones, friends, and the showbiz industry in deep sorrow by leaving this mortal world so quickly.In this regard, Diane Keaton’s family, while speaking to PEOPLE, disclosed the cause of death on Wednesday, October 15, that the actress passed away due to pneumonia.However, the Father of the Bride actress’s household, in a statement, thanked every individual sending extraordinary messages and support during the tragic loss of Keaton.The released statement said, “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.”“She loved her animals, and she was steadfast in her support of the unhoused community, so any donations in her memory to a local food bank or an animal shelter would be a wonderful and much-appreciated tribute to her,” the statement further stated, referring to the late star’s passions.Moreover, a friend of Diane Keaton who previously spoke to the news outlet claimed that Diane Keaton’s health had declined very suddenly, which was heartbreaking news for her friends and family.“In her final months, she was surrounded only by her closest family, who chose to keep things very private. Even longtime friends weren’t fully aware of what was happening,” the source further said.Read More: What led to Diane Keaton’s death?It should be noted that Diane Keaton passed away on October 11, leaving an unforgettable acting legacy for newcomers to the acting industry.Meanwhile, Keaton played a variety of major parts in films such as The Godfather, Father of the Bride, Annie Hall, Something’s Gotta Give, and The First Wives Club, demonstrating her exceptional acting abilities.