Without the book, there’d be no movie. And without the man—and his lingering memory of an article about a case of real-life demonic possession—there’d be no book. William Peter Blatty, author of the 1971 best-seller The Exorcist that became the influential 1973 horror movie classic, has died at age 89.
Source: io9 – RIP William Peter Blatty, Author of The Exorcist