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Diane Keaton 's longtime friend and collaborator reflected on her final visit with the actress ... recalling how she was struck by Keaton's noticeable weight loss in the weeks before her death.

In an interview with PEOPLE , Carol Bayer Sager says she saw the Oscar winning star just two or three weeks ago and was surprised by the change in her appearance. "She was very thin," Sager shared. "She had lost so much weight." Instagram / @carolebayersager

According to Sager, Keaton had spent much of the year in Palm Springs after wildfires damaged her California home, and the two friends hadn't seen each other as often. "When she came back, I was kind of stunned by how much weight she'd lost," Sager said, adding that despite the physical changes, Keaton

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