Francisco Alvarado is an investigative journalist based in Miami, Florida.
In 2006, four sex workers were found dumped in a ditch near Atlantic City's border. The serial killer has yet to be identified.
Two years after the Jonestown Massacre, ex-members of the cult, Al, Jeannie, and Daphene Mills, were murdered. The killer was never caught.
Jana Monroe, one of the FBI's first female agents with the Behavioral Science Unit, on what it was like interviewing serial killers.
Was bullying during his early years to blame for Joel Rifkin becoming one of the most prolific serial killers in New York history?
After Tom Kolman's mysterious death, Kingston, New York dentist Gilberto Nunez, who pretended he was with the CIA and was having an affair with Kolman's wife, was tried for his murder.
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.
During the 1990s and early 2000s, more than 30 women were targeted by serial killers, including Derrick Todd Lee, in the Baton Rouge area.
Sex trafficking has evolved in the 21st century to focus heavily on social media and financial mobile applications. And despite efforts to stop it, it's increasing globally.
