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

Investigation Discovery

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.

Signs of a Psychopath

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

When Omaha, Neb., police officers arrest the driver of a stolen van, he shocks detectives by giving an unsolicited confession to a gruesome murder, and it is only the first of many chilling revelations.

In My Van, I'm the Aggressor

When a beloved elderly couple disappears on a Sunday afternoon, one person knows their battered bodies lie dead at the bottom of a well; that man is the couple's son, who lives off his parents' charity yet takes pleasure in murdering them.

Ladies First

Behind a church lies a dismembered body burned beyond recognition; investigators identify the victim and receive a tip the suspect is female; a police interview reveals her as the most remorseless psychopathic killer they've ever seen.

I'm Gonna Recycle a Snitch

A man confesses to accidentally killing his best friend while cleaning his gun; during his interrogation, he stuns police by revealing that he's behind a long trail of bloodshed and is a serial killer who seems to consider himself an angel of mercy.

Hell to Look Forward To

A man finds his girlfriend and her mother murdered in their beds at night; he calls 911 for help, but police discover his urge to seek revenge.

I Wanted Her to Hear It

After his conviction for the brutal slaying of his wife, a Florida inmate lays claim to another unsolved murder 17 years prior, revealing that he's a manipulative psychopath with a history of violence and an unquenchable thirst for revenge.

Heat Will Destroy

Searchers for a missing woman find her brutally beaten body in a dilapidated house near her home; the case goes cold until a local teen steps forward to reveal that he's the killer.

It Wanted to Kill Somebody

A crash on a North Dakota highway leaves one passenger dead but the driver unscathed; when investigators see that the victim has stab wounds, they know there was foul play; detectives interrogate the driver.

I Was in a Zone

A mother who calls 911 to report her 32-year-old son is threatening her turns up dead in her home; he becomes the only suspect, and when he turns himself in, his pragmatic retelling of the slaying isn't just cold-hearted, it's psychopathic.

I Guess My Life Is Over Now

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

S5 E6 | I Wanted Her to Hear It