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.

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A small SD card contains horrifying images and videos of a woman's murder; when someone gives it to Anchorage police, detectives come face-to-face with a sexual psychopath who has a shocking tale to tell.

Signs of a Psychopath

That's When My Nightmare Started

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

Evilness Inside My Head

Investigation Discovery HD

Police charge a son and his wife with the murder of his father until a tip comes from a woman claiming her ex-husband and his friend admitted to the brutal killing; detectives interview the new suspects and uncover a pair of cold-blooded psychopaths.

He Got Such a Rush From It

Between 1991 and 2001, several violent sexual assaults occur along I-85 between Wyoming and Utah; the cases remain cold until almost two decades later, when advancements in DNA technology lead detectives straight to a psychopathic sexual predator.

Every Time Was Like Christmas

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

Police find a woman shot to death in a car, and the prime suspect is her dangerous psychopathic boyfriend.

Can You Count Bullets?

A gruesome discovery in a Florida landfill reveals two young psychopathic parents with parasitic tendencies and a disturbing plan for a double murder.

Everybody Believes in Bad People

When officers arrive at a suburban home regarding a felonious assault, they find a bloodied and lifeless woman in her minivan. Detectives later interview her estranged husband, revealing a rage-filled psychopath with a revenge fantasy inspired by a movie.

That's What You Do With a Knife

When detectives find an elderly woman dead after someone stuffs her in her own closet, they know they are not dealing with a normal killer. Instead, they discover the culprit is a troubled teenager with a fantasy to rape and kill.

The Biggest Adrenaline Rush

When a psychopathic husband kills his young wife and leaves her decapitated head in a bathtub, detectives question him about the crime; when he offers little in the interview, they realize they are confronting a malingering psychopath with control issues.

Something Took Control of Me

Weeks after Christmas, police find a wife and her three young children decomposing in their beds, while her husband is alive yet despondent; what appears to be a mass suicide later proves to be a murder orchestrated by a psychopathic family annihilator.

The Apocalyptic End

When a mother, covered in blood and holding a barely breathing newborn, arrives at the hospital, medical staff uncover a faked birth. When investigators interview the woman, they soon realize they are dealing with a violent, infant-stealing psychopath.

I Had Everybody Fooled

When a grandmother vanishes, her grandson spins a twisted narrative about her demise and the disturbing location of her body inside a freezer; it doesn't take long for detectives to uncover the killer responsible, a parasitic psychopath.

I Wanted To Keep Her

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S11 E13 | That's What You Do With a Knife