F2: Forensic Factor

A serial rapist stalks and preys on elderly women in a reign of terror that spans nearly two decades.

A sniper who targets abortion doctors turns murderous, throwing a city into panic.

A sniper who targets abortion doctors turns murderous, throwing a city into panic.

Investigators probe the murders of prostitutes in Spokane, where the killer has left the victims with smiling mementos.

A jogger discovers the partially mummified remains of a human body.

A double homicide in Hudson, Wisconsin leaves a small town reeling and two young detectives with little to go on.

In 2001, the Louisiana State University area of Baton Rouge was held hostage by a serial killer.

Profiling arsonist John Leonard Orr.

Las Vegas shows its darker side when the burnt body of a prominent business man is uncovered.

A phantom sect of white supremacists claims responsibility for a series of bombings and bank robberies in Spokane.

Four people are found slaughtered in a factory in Bartow, Florida but the prime suspect has a perfect alibi.

A 22-year-old college student is found raped and strangled with a garrotte on a Buffalo bike path.

The world's top criminal investigators, forensic scientists and behavioural analysts investigate three cases of serial killers.