After Father Merrin (Max von Sydow) dies mysteriously during the exorcism (maybe from a heart attack), Father Karras (Jason Miller) gets angry and gets into a fist fight with Regan (Linda Blair). As they are fighting, the Devil comes out of Regan and into Karras, but Karras manages to commit suicide by flinging himself out of the window to prevent the Devil from becoming a part of him. Regan is saved.
Thanks, David K!
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