Famed Author William Peter Blatty, who wrote “The Exorcist,” has died. He was 89.

Blatty died Thursday at a hospital in Md.  His widow, Julie Alicia Blatty, told the Associated Press, that his cause of death was multiple myeloma, which isa form of blood cancer.

The book, “The Exorcist” was published in 1971 and Blatty went on to write and produce the movie, which was released  in 1973.  The movie has spawned a television show and the movie itself is aired every year around Halloween time.