Friedrich Heinrich Karl "Fritz" Haarmann stands among Europe's most prolific serial killers. Operating in post-World War I Hanover, this predator systematically hunted young men and boys—many of them homeless—from the city's central train station, luring them to his attic apartment with promises of shelter before murdering them in acts of extraordinary brutality.

Born on 25 October 1879 in Hanover, Haarmann had a criminal history predating his killing spree. He had previously been arrested for theft and child sexual abuse. By 1918, remarkably, he had become a police informant—a position that may have provided cover for his escalating crimes. Between 1918 and 1924, he murdered at least 24 victims, though the true number may have been higher. His victims ranged in age from 10 to 22 years old, predominantly young men and boys without family connections to report them missing.

Haarmann's hunting ground was Hanover's railway station, where transient youth congregated. He would identify vulnerable targets and offer them a place to sleep. Once in his attic apartment, victims fell into his trap. His preferred method of killing was savage and intimate: he would bite through his victims' throats—often targeting the Adam's apple—frequently during sexual assault. Death came by bleeding or strangulation.

After killing, Haarmann employed ruthless efficiency in disposing of evidence. He dismembered bodies using an axe, then scattered the remains across the Leine River, which ran through Hanover. Some body parts were burned in a gas oven; others were flushed down the communal toilet. In a grotesque display of opportunism, he sold his victims' clothing on the black market, converting their deaths into profit.

The killer's reign continued unchecked until May–June 1924, when children playing on the banks of the Leine River discovered human skulls. The grim discovery triggered an investigation that recovered over 500 bones from the river. As authorities pieced together the remains and cross-referenced missing persons reports, Haarmann's apartment and activities came under scrutiny. The evidence against him proved overwhelming.

Haarmann was convicted on 19 December 1924 by the Schwurgericht beim Landgericht Hanover (the regional court). He received the death sentence. On 15 April 1925, he was executed in Hanover—the same city where he had hunted, killed, and disposed of his victims with impunity for nearly a decade.

The case shocked Weimar Germany and exposed troubling gaps in law enforcement. A police informant with a history of sexual crimes against children had operated freely, accessing information that helped him evade detection while preying on society's most vulnerable members. The nickname "The Vampire of Hanover"—or "The Wolf Man"—reflected the public's perception of Haarmann as something inhuman, a predator who had stalked the city's margins with calculated savagery.

Today, the victims of Fritz Haarmann are remembered through memorials in Hanover, ensuring that those young lives—discarded and dismembered by a killer who saw them as disposable—are not forgotten.

**Sources:** https://en.wikipedia.org/wiki/Fritz_Haarmann https://www.rtl.de/rtl-nord/der-killer-vampir-von-hannover-fritz-haarmann-biss-seinen-opfern-die-kehle-durch-id1673547.html https://www.atlasobscura.com/places/the-victims-of-fritz-haarmann-memorial https://www.joyn.de/bts/themen/true-crime/true-crime-fall-fritz-haarmann-das-steckt-hinter-dem-horror-des-vampirs-von-hannover-22503 https://www.esquire.de/news/gesellschaft/fritz-haarmann-schlaechter-von-hannover-geschichte