William Peter Blatty, the famed creator of The Exorcist and its sequel Legion, has passed away at the fragile age of 89. According to his wife Julie Blatty, the cause of his tragic demise was multiple myeloma, a form of plasma cell cancer. William Blatty had a prolific career, having written over a dozen novels, an autobiography, and various film screenplays, two of which he directed. The Exorcist is perhaps his most celebrated work, having received critical acclaim and going on to be adapted into an Oscar-winning film that spawned two sequels, two prequels, and a television series. Blatty's legacy has been set in stone and will continue to influence generations to come.