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

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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 E18 | Evilness Inside My Head