Was a playright, screenwriter, and novelist known for Butch Cassidy and the Sundance Kid along with The Princess Bride among other things. His health had been failing for some time, and over the summer his condition deteriorated.

https://deadline.com/2018/11/william-goldman-dies-oscar-writer-butch-cassidy-and-the-sundance-kid-all-the-presidents-men-1202503283/

Not a bad writer...