The Judge and the Assassin (movie, 1976)

France, 1893. Joseph Bouvier attempts to shoot his love who refused to marry him and to commit suicide. Upon release from the filthy asylum where he was placed, with bullets still remaining in his head, he wanders the country roads and rapes and murders many teenagers over years. The judge Rousseau captures him, but to serve his ambition seeks to avoid that Bouvier is simply declared insane.