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Investigation Discovery continues its heritage of providing in-depth  compelling documentaries & shows.

Investigation Discovery

Experts examine unique characteristics of female psychopathic killers, whether they are as rare as people imagine, and their crimes.

Signs of a Psychopath

Deadly Women

A missing persons report leads police to a career criminal and his girlfriend; they uncover a twisted world of illicit schemes, macabre fantasies, and a puppet master manipulating young women down a dark path of sex, drugs and exploitation.

This is What I Chose to Be

Investigation Discovery continues its heritage of providing in-depth, compelling documentaries & series that challenge viewers to think about key issues that shape our culture and define our world.

A New Hampshire town reels after police arrest four teenagers for robbing and murdering a 42-year-old mother and maiming her 11-year-old daughter; detectives uncover two suspects with the characteristics of sadistic psychopaths.

An Excuse to Kill Somebody

Police find a 17-year-old female's dead body in a ditch with two gunshot wounds; the investigation centers on two friends of the victim claiming her death was an accident, but detectives uncover it was a thrill kill carried out by evil psychopaths.

Kids Will Be Kids

A man calls 911 with his dying breath, and first responders arrive to find him brutally murdered and stabbed 59 times; when detectives question his best friend, they uncover a tangled story of deception and jealousy that ends in psychopathic rage.

He Thought We Were Buddies

A killer shoots a young woman dead in her boyfriend's Orlando, Fla., apartment; hours later, he turns up in a hospital bed 500 miles away with a gunshot wound and a bizarre story that unravels to reveal he's a lying, callous psychopath.

I Still Care About Her

A gunman shoots a man dead as he runs along a country road, and first responders find a witness standing next to the body with a strange story to tell; detectives unravel the lies of a callous psychopath who takes out his frustrations in bloodshed.

He Didn't Know I Was There

Investigators search a farm for a missing man and find a human leg bone on the property; the owner, Susan Monica, admits that her pigs ate her tenant alive, and he's not the only victim; Monica despises humans but loves her pigs.

Having Breakfast on Him

A racially motivated serial killer on death row who targeted civil rights leader Vernon Jordan and pornography publisher Larry Flynt confesses to additional unsolved murders with the help of a shrewd female prosecutor.

Hey Look, I'm a Serial Killer

A woman finds her elderly brother dead in his bedroom with his throat slashed; uncovering the truth poses a challenge for detectives, as the individual responsible for killing him is a manipulative psychopath who craftily deflects blame.

Something a Man Would Do

A look inside the mind of psychopaths to discover when common pervasive traits deviate into violence, such as grandiosity, sadism, superficial charm, manipulation, lack of empathy and having a parasitic lifestyle.

How to Spot a Psychopath

When a priest from Florida goes missing, police focus on a troubled ex-convict whom he helped support; through multiple interrogations, a psychopathic killer reveals details of a twisted vengeance that escalates to a chilling murder.

I'm a Sick Puppy

Revisiting some of the most dangerous killers in modern history to see which psychopathic traits they exhibited.

S5 E22 | He Didn't Know I Was There