Diane Keaton’s "declined very suddenly" in the months before her death.
The Oscar-winning actress' passing at the age of 79 was announced on but no details were revealed r about the circumstances that led to her death.
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,” they added.
"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 insider concluded.
In March, Diane put her "dream home" in Brentwood, California, up for sale, despite previously vowing to stay there forever, with another source saying, "She lived in Brentwood for many years.”
"She loved her neighborhood. Up until just a few months ago, she'd walk her dog every day. She was usually dressed the same, with a hat and her signature sunglasses regardless of the weather,” they added.
The insider further mentioned, "She was always very nice, funny and chatty. She'd talk to her dog like he was a person. She was eccentric and had this old-school Hollywood aura. She was very, very special."