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Diane Keaton, who died at age 79 on Oct. 11 in California, had been experiencing a sharp downturn in her health, a source tells PEOPLE exclusively.

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

The Oscar winner had also listed her Los Angeles "dream home" for sale in March.

Diane Keaton 's health had taken a sharp turn in recent months.

“She declined very suddenly, which was heartbreaking for everyone who loved her,” a friend of the Oscar winner — who died on Oct. 11 at age 79 in California — tells PEOPLE exclusively. “It was so unexpected, especially for someone with such strength and spirit."

The source adds, "In her final months, she was surrounded only by her closest family, who chose to keep things very private. Ev

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