Jeffrey Dahmer was just 18 when he committed his first murder, much younger than the average age of serial killers, which researchers have determined is around 29 years old. Why did he wait nearly a decade before killing his next victim?

Over nearly two decades, Dennis Rader murdered at least 10 people in the Wichita, Kansas area under the pseudonym BTK ('Bind, Torture, Kill'). But despite his repeated taunts to the police and media, investigators were unable to hone in on a suspect.

Gary Heidnick's crimes helped inspire Buffalo Bill's character in 'Silence of the Lambs.' We spoke with the killer and self-described pastor's defense lawyer, Charles Peruto, Jr., about what it was like representing one of Philadelphia's most infamous criminals.

In December 2020, a team of civilian codebreaker broke one of the unknown killer's messages after 51 years. Are we now closer to finally finding out who he is?

In the 1960s, an unidentified serial killer terrorized London sex workers. The Hammersmith Nude Murders remains one of Britain's most infamous unsolved crimes.

After the Golden State Killer's arrest in 2018, dozens of rape victims learned their assaults weren't isolated incidents but the work of a serial killer. Read how many survivors bonded through mutual trauma.

Peter Sutcliffe had the makings of a serial killer before he claimed his first victim and continued on a murderous spree that terrorized England for nearly five years.

Nearly 20 years ago, retired NYPD detectives started tracking the suspicious drownings of young men across the country after they discovered a graffiti smiley face near at least a dozen locations where they found bodies.

Lisa McVey was 17 years old when she was abducted, beaten and raped by a serial killer—and managed to survive. We spoke with McVey, now a master deputy in the Hillsborough County (Florida) Sheriff's Office, about how she outsmarted her kidnapper, Bobby Joe Long.

We spoke with legendary FBI profiler John Douglas about how a childhood injury may have pushed Joseph Paul Franklin to serial murder.