The Exorcist (1973) ending / spoiler
Father Karras body is taken over by the demon that once possessed Reagan. In order to kill himself, Karras musters up the strength to leap out of the top story window to forever vanquish the demonic force residing in the house. Reagan is physically scarred, but flushed of the evil that once possessed her soul. (submitted by Vitascope)
Submitted by Steve Lawton