The Exorcist III

In a final confrontation with Patient X (Jason Miller), Detective Kinderman (George C. Scott) gets flung up onto wall. A priest whom was presumed dead is actually alive and tells Patient X to "fight" while showing him a cross. Patient X overcomes the killer who was possessing him and releases Kinderman from the ceiling. As he falls, Patient X tells him to shoot him. Kinderman shoots him a few times in the chest. Then to "free him" he shoots him in the head.
Thanks, David K!

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