An Unexpected Killer

A deep dive into the minds of disturbed couples who embark on crime sprees together.

This in-depth docu-series tells the untold true story of the life of Aaron Hernandez, the former NFL superstar who was convicted of murder and ultimately took his own life in prison. Featuring special interviews with Aaron's fiancée, the lead defense attorney, the prosecutor, friends, former teammates, journalists and more, the series examines the intimate details of his tragic life, reveals his darkest secrets and explores what led him down such a dark and destructive path.

Some of the world's most notorious murders are the subject of "It Takes a Killer," which investigates the crimes from the perspective of the killers, trying to get inside their minds and determine their motives. Leading homicide investigators and experts from such agencies as the FBI and Scotland Yard take a look at the evidence pulled from crime scenes and profile the killer's behavior to try to piece together the details of each murder, explaining when, why and how each criminal committed the crime. For the wannabe detectives watching the show, the experts also reveal how the crime was solved — which often requires authorities to think like a killer.

A look at murder cases where investigators expose the dark world of cults that murder.

The series explores the dreadful sphere of contract killings and the alarming rise of such cases. Featuring rare camera footages and surveillance tapes exposing murderous schemes that place seemingly innocent individuals in the midst of a conspiracy. Investigators and undercover agents are also filmed in action or shared their experiences in thwarting those nefarious plots.

Exploring the psychology and past of cold-blooded siblings who have carried out vicious murders.