After a repressive religious upbringing filled with abuse from his fundamentalist father, Dayton Leroy Rogers grew into a rage-filled young man. 

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After a 7-month hiatus between 1918 and 1919, the Axeman jumped back into his killing spree. City officials tried to track down the mysterious killer, but their hunt led to nothing but dead ends and wrongful convictions. To this day, the Axeman's true identity remains unknown. This episode originally aired April 2020.

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While the U.S. was wrapped up in the final days of World War I, New Orleans was facing an enemy right in their own backyard. In the early 20th century, a wave of fear rolled through Crescent City as a mysterious man began axing people in the dead of night while they were fast asleep. This episode originally aired March 2020.

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By 1985, the Monster of Florence had claimed 16 lives—but authorities were no closer to catching the killer than when they'd started their investigation, and the trail was getting colder every day.

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One of Italy’s most notorious serial killers has never (definitively) been identified. The mysterious Monster of Florence murdered couples in their cars, beginning in 1974. The crimes were so horrific that all of Florence was on edge, and the hunt for the killer was vast. This episode originally aired February 2021.

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In the so-called murder capital of the world, Terry Childs grew up in the shadows of infamous serial killers. Until he became one himself. 

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Following a string of brutal murders throughout the 1960s, the Zodiac Killer continues to write letters taunting the press and police. This episode originally aired in February 2020.

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In the summer of 1969, newspapers in San Francisco began receiving coded letters from a man who would come to identify himself as "the Zodiac." The killer confessed to a string of brutal murders and would go on to terrorize the Bay area into the early 1970s. This episode originally aired in February 2020.

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Some hitmen must walk the line between being a family man at home and a killer at work. But Greg Scarpa wasn't your ordinary hitman. He was paid by the FBI as a Criminal Informant and was instrumental in helping them solve crimes. But some think his close relationship with his handler gave him a license to kill.

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Starting in the 1950s, Greg Scarpa killed his way up the ladder to become the Colombo family's main hitman. By the mid-1980s, his children were in on the family secret. And the only thing more surprising than the number of kills he racked up was who else was paying him.

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