United Kingdom, Oct. 12 -- Diane Keaton's health reportedly "declined very suddenly" in the months before she died.

The Oscar-winning actress' passing at the age of 79 was announced on Saturday (11.10.25) and while no details have been released about the circumstances surrounding her death, insiders admitted it was "unexpected" because she had confided in so few people.

A source told People magazine: "She declined very suddenly, which was heartbreaking for everyone who loved her.

"It was so unexpected, especially for someone with such strength and spirit.

"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."

In Marc...