The Exorcist was made into the movie "The Exorcist III" in 1990. Like "The Exorcist", it involves demonic possession. The book was the focus of a court case over its exclusion from "The New York Times" Best Seller list. Blatty based aspects of the Gemini Killer on the real-life Zodiac Killer, who, in a January 1974 letter to the "San Francisco Chronicle", had praised the original "Exorcist" film as "the best satirical comedy that I have ever seen". The Exorcist is a 1973 American supernatural horror film directed by William Friedkin, adapted by William Peter Blatty from his 1971 novel of the
The Exorcist III deceased serial killer. Blatty based aspects of the Gemini Killer on the real-life Zodiac Killer, one of several serial killers who enjoyed the original "Exorcist." Blatty, who wrote the original "Exorcist" novel (1971) and the screenplay for its 1973 film adaptation, conceived "The Exorcist III" with "Exorcist" director William Friedkin attached to direct. When Friedkin left the project, Blatty adapted the script into a bestselling novel, "Legion" (1983); Morgan Creek Productions bought the film rights, with Blatty as director. To Blatty's frustration, Morgan Creek demanded extensive last-minute changes, including the addition of an exorcism sequence for the climax. Though some