Diane Keaton’s passing due to pneumonia wasn’t unexpected, according to a close friend who mentioned she had been unwell for some time.

The cherished actress, who passed away over the weekend at the age of 79, had been battling an undisclosed illness that contributed to her deteriorating health, the friend revealed to TMZ on Wednesday.

“The Keaton family is deeply appreciative of the outpouring of love and support they have received in recent days on behalf of their beloved Diane, who succumbed to pneumonia on October 11,” a family representative shared in a statement on Wednesday, confirming the cause of her death.

“Diane was passionate about her animals and dedicated to supporting the homeless community. Donations in her memory to a local food bank or animal shelter would be a fitting and appreciated tribute,” the representative added.

The announcement of Keaton’s death was made on Saturday, with the family requesting privacy during this time of profound sadness.

It was later reported that the Los Angeles Fire Department had responded to the movie star’s home just after 8 that morning and transported her via ambulance to a local hospital.

Following Keaton’s death, a pal disclosed that her health had “declined very suddenly” in recent months, but she and her tight-knit circle “chose to keep things very private.”

Her longtime friend Carole Bayer Sager went on to share that she was “stunned by how much weight [Keaton had] lost” when she last saw her less than a month ago.

A source added that the mother of two “loved” her Brentwood, Calif., neighborhood, where she lived for many years, and that “up until just a few months ago, she’d walk her dog every day.”

To the surprise of those who knew her, Keaton — who battled both skin cancer and bulimia during her life — listed her “dream home” in March.

Her last Instagram post was in April, as was one of her last public outings.

Hours after news of Keaton’s passing broke, Ed Begley Jr. recalled seeing her at her “Something’s Gotta Give” co-star Jack Nicholson’s 88th birthday party.

“It was good to see her there,” he said, adding, “She loved Jack Nicholson, as I do, and Jack loved her. So I don’t mean to speak for him. I’m sure he’s as devastated as I am by her loss.”

The actor, 76, became emotional as he reminisced on working with Keaton, whom he described as a “wonderful actress” and “wonderful lady.”

“I played her brother in an HBO film called ‘Running Mates’ with Ed Harris,” he noted. “So I’m glad I knew her these many years.”