Jung Yoo-jung, a 23-year-old true crime fan, killed a female tutor in South Korea. Her motive? She was curious about what it would be like to murder someone.

Journalist Bob Cyphers on the decades-long search for the unidentified serial killer and what's made the process of identifying him so hard.

Jana Monroe, one of the FBI's first female agents with the Behavioral Science Unit, on what it was like interviewing serial killers.

Experts speak with A&E True Crime to clear up common myths around serial killers.

Jillian Lauren, author of 'Behold the Monster: Confronting America's Most Prolific Serial Killer,' speaks with A&E True Crime about her relationship with Samuel Little, the most prolific serial killer in U.S. history.

Was bullying during his early years to blame for Joel Rifkin becoming one of the most prolific serial killers in New York history?

Barbara Butcher, a former New York City death investigator, on what the work entails and which cases have stuck with her decades later.

New York's infamous serial killer, who murdered six people in the 1970s and is up for parole in 2024, is at Shawangunk Correctional Facility. But will he be released?

Five of the Chicago serial killer's 33 victims from the 1970s remain unidentified, but the Cook County Sheriff's office is continuing the work to ID them.

In 2003, Steven Mack, a homicide detective with the Huntington Beach Police Department, took a leading role in retrying a twice-overturned murder case against Rodney Alcala. His efforts led to the uncovering of a prolific serial killer.