Ruthless drug lord Pablo Escobar turns Columbia into the murder capital of the world and may have been responsible for 4,000 to 5,000 murders.
Son of Sam
S7 E2
David Berkowitz, aka the Son of Sam, goes on a yearlong murderous rampage killing six people in 1976 and bringing New York City to its knees.
The Boston Strangler
S7 E3
Known as the Boston Strangler, Albert DeSalvo's murder spree claims the lives of 13 women, many of whom he strangled to death with their own nylon stockings.
Osama Bin Laden
S7 E5
On the FBI's Most Wanted list for more than a decade, Al Qaeda founder Osama Bin Laden orchestrates an attack against the United States, using 19 militants to hijack four airplanes with which to carry out suicide missions on Sept. 11, 2001.
The Nurse Killer Richard Speck
S7 E6
In 1966, mass murderer Richard Speck systematically tortures, rapes and murders eight student nurses from South Chicago Community Hospital.
BTK Killer
S6 E1
Seemingly average husband and father-of-two Dennis Rader lives a double life as a serial killer who terrorizes the Wichita, Kan., area from the 1970s to the '90s as the self-proclaimed BTK Killer.
John Wayne Gacy
S6 E3
John Wayne Gacy, widely thought to be the inspiration for Stephen King's character Pennywise the Clown, murdered 33 young men and teen boys, most of whom he buried in the crawl space beneath his home.
The Gainesville Ripper
S6 E4
Three years after five brutal and disturbing murders in Gainesville, Fla., Danny Rolling is called to trial, but he unexpectedly pleads guilty to each charge and claims he wanted to become a superstar like Ted Bundy.
Aileen Wournos
S6 E5
Hitchhiking sex worker Aileen Wuornos garnered national attention after she was charged with murdering at least six men in less than a year by shooting them at point-blank range.
Ken & Barbie Killers
S6 E6
Canadian serial killers Karla Homolka and her husband, Paul Bernardo, drugged, raped and murdered three teens, including her younger sister.