(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 ...

Serial killers may seem like a modern phenomenon tied to the 20th century, but history reveals that humans have been fascinated—and horrified—by repeat murderers for centuries. While recordkeeping in ...

For lack of a better term, the 1970s and '80s are often called America’s “Golden Age” of serial killers throughout the Pacific Northwest. (Its nickname, after all, is “America’s Killing Fields.”) In ...

Forensic sketches of the Doodler from 1975 (left) and 2018. Source: The Doodler/Wikipedia The Doodler—one of San Francisco’s most well-known cold-case murderers—is back in the news. San Francisco ...

When Gil Carrillo joined the homicide division at the Los Angeles Sheriff’s Department in the early Eighties, his future partner Frank Salerno was already something of a celebrity. He had recently ...