At the moment, there are no specifics, but we do know that she has passed away at 79.
Interestingly, her maiden name was Hall! Wonder if the character name was coincidence or purposeful.
Diane Keaton at 79
Diane Keaton at 79
You trying to tell me you didn't hear that shriek? That was something trying to get out of its premature grave, and I don't want to be here when it does. - Phantom of the Paradise (1974)