By Hillel Italie, The Associated Press NEW YORK — Novelist and filmmaker William Peter Blatty, a former Jesuit school valedictorian who conjured a tale of demonic possession and gave millions the fright of their lives with the best-selling novel and Oscar-winning movie “The Exorcist,” has died. He was 89. Blatty died Thursday at a hospital in Bethesda, Maryland, where he lived, his widow, Julie Alicia Blatty, told The Associated Press.