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

Investigation Discovery

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.

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

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 E24 | He Thought We Were Buddies