Fritz Haarmann: The Butcher of Hanover – Bones in the River

Adolfo Constanzo: The Godfather of Matamoros

In April 1989, investigators discovered a horrifying scene at Rancho Santa Elena near Matamoros, Mexico: a ritual cauldron filled with human remains and the mutilated bodies of fifteen victims. At the center of this nightmare was Adolfo Constanzo, a Cuban-American cult leader whose supernatural “insurance” racket had protected major drug shipments across the U.S.-Mexico border—until the abduction of American student Mark Kilroy brought everything crashing down.

Fritz Haarmann: The Butcher of Hanover – Bones in the River

In the summer of 1924, hundreds of human bones surfaced from Hanover’s Leine River, exposing one of Weimar Germany’s most shocking serial murder cases. Fritz Haarmann, a petty criminal and police informant, was ultimately revealed as the killer of at least 22 young men whose dismembered remains had been dumped in the water. This episode traces the discovery of the bones, the city’s growing panic, and the disturbing double life of the man known as the Butcher of Hanover.

The Long Island Serial Killer: Gilgo Beach Bodies and the Architect of Massapequa Park

In the early hours of May 1, 2010, Shannan Gilbert vanished after a frantic 911 call from Oak Beach, Long Island. Months later, police discovered a cluster of bodies along Ocean Parkway that would become known as the Gilgo Four, all escorts who had advertised on Craigslist. Over the next decade the search would expand, uncovering at least ten victims and leading investigators to a suspect whose own home sat just miles from the burial sites.

Dennis Nilsen: The Civil Servant Who Killed 15 Men and Couldn't Let Go

In this chilling episode of Forgotten Serial Killers, we examine the double life of Dennis Nilsen, a quiet Scottish-born civil servant who murdered at least twelve young men in North London between 1978 and 1983 while maintaining an unremarkable routine as a job-centre clerk and trade-union steward.

Cary Anthony Stayner - The Other Brother

In this haunting episode of Forgotten Serial Killers, we examine the life of Cary Anthony Stayner—the overlooked older brother of Steven Stayner, whose abduction made national headlines in 1972. While America celebrated Steven’s miraculous return, Cary grew up in the long shadow of that tragedy, eventually becoming the Yosemite serial killer who murdered four women in 1999.