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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.

The idea that a child may possess the same wicked traits found in the most sadistic killers is every parent's worst nightmare; experts examine the early warning signs in psychopathic killers apprehended as teens and young adults.

Signs of a Psychopath

Birth of a Psychopath

When a 64-year-old grandmother does not return home from her morning walk, local police uncover that the man responsible for her disappearance is not only a pathological liar but a sexually deviant psychopath carrying out a twisted fantasy.

I'm Not a Weirdo

Six months pregnant Martine Bernard's family reports her missing; days later, her father vanishes as well; when officers interview Martine's husband, Cassandritz Blanc, they find a calculating psychopath willing to do anything to cover his tracks.

She Said She Didn't Care

A 33-year-old oil rig worker calls 911 to report his girlfriend missing; he seems to be helping in the time-critical hunt to find her; a failed polygraph test leads detectives to suspect this seemingly caring boyfriend is a psychopath.

You're Not Leaving

Hikers in Portland discover the badly decomposed body of a raped and strangled young girl; A month later, another woman turns up brutally murdered in same fashion; the prime suspect is a homeless drifter harboring dark sexual fantasies.

My Pretty White Shoelaces

After meeting with her divorce attorney and estranged husband, a devoted mother of three vanishes into air; as friends and family desperately try to locate her, the husband instead plays a psychopathic game of cat and mouse with investigators.

You're Never Going to Get It out of Me

A man finds his family slaughtered in their West Virginia home; the oldest son, 16-year-old Gavin Smith, is missing; he turns up hiding at his girlfriend's.

His Parents Didn't Like Me

A 19-year-old woman vanishes, and the suspect is a former high school classmate with whom she had been communicating days earlier. The family is weary, for the suspect has a notorious past filled with sexual deviancy and homicidal urges toward women.

Unorthodox and Weird

Weeks after an 18-year-old is reported missing by a friend, his clothes are found burned in a trash can behind a suburban house; witnesses lead investigators to a young man with a violent past; they quickly discover he had an accomplice.

I Slept With a Knife

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

S8 E4 | His Parents Didn't Like Me