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Friedrich Heinrich Karl "Fritz" Haarmann (25 October 1879 – 15 April 1925) was a German serial rapist and serial killer, known as the Butcher of Hanover, the Vampire of Hanover and the Wolf Man, who committed the sexual assault, murder, mutilation and dismemberment of at least twenty-four young men and boys in the city of Hanover between 1918 and 1924.
Found guilty of twenty-four of the twenty-seven murders for which he was tried, Haarmann was sentenced to death by beheading in December 1924. He was subsequently executed by guillotine in April 1925.
Haarmann became known as the Butcher of Hanover (German: Der Schlächter von Hannover) due to the extensive mutilation and dismemberment committed upon his victims' bodies, and by such titles as the Vampire of Hanover (der Vampir von Hannover) and the Wolf Man (Wolfsmensch) because of his preferred murder method of biting into or through his victims' throats.