Unknown recordings reveal how journalist Laura Greenberg befriended serial killer Doug Gretzler, visiting him 350 times. Her ...

Serial murder is neither a new phenomenon, nor is it uniquely American,” reads a public report from the FBI on the subject.

H.H. Holmes is believed to be the United States’ first known serial killer. In 1886, Holmes, whose original name was Herman ...

(CNN) -- For decades, criminologists and true crime documentaries have attempted to understand what causes serial killers to commit the atrocities they do. Dennis Rader, John Wayne Gacy, Jeffrey ...

A Canadian man who died in 2019 has been identified as the perpetrator of three cold case homicides in Toronto, and investigators believe there could be more victims. Toronto police said Thursday ...