Mia Farrow has reacted to Diane Keaton's shocking death following their complicated history. "She was an absolutely wonderful actress - and a rare and fascinating person," Farrow, 80, wrote about Keaton via Instagram on Saturday, October 11. "Thoughts with her children and sisters. Rest in peace Diane." Keaton's spokesperson announced her death at age 79 and asked for "privacy" on behalf of the Oscar winner's family on Saturday, though no official details have been released.