serial killer uses hammer

This documentary ("The hammer maniacs") offers a full report and reconstruction of the notoriously disturbing killing spree by the Dnepropetrovsk maniacs in 2007.

A young maniac addicted to hammers kills his girlfriend and begins a path of killing, until a police officer launches an operation to discover the killer's identity.

A would-be slasher villain's defining characteristic may be his biggest downfall.

Following the brutal rape of a young woman by a gang of construction workers, a mysterious figure wearing a motorcycle helmet and driving a gold hearse begins hunting the perpetrators down. The masked avenger's weapon of choice, obviously, is a nail gun, with which he (or could it be she?) takes out the rapists one by one. Just who is this murderous vigilante?

A young boy murders his mother and her lover with a hammer. Ten years later, a wave of teenage murders plagues the same area.

A weary hitman— who must bash his own head with a hammer in order to enter a murderous state of parasomnia— is promised freedom from self-mutilation upon the completion of one last hit job.

A manic teen lures and kidnaps one of his peers on claims of bullying and plans to instill justice.