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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

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.

Investigation Discovery HD

Investigation Discovery

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 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

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

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 E1 | I Guess My Life Is Over Now

E11 | How to Spot a Psychopath

E10 | I'm a Sick Puppy

E9 | In My Van, I'm the Aggressor

E8 | Ladies First

E7 | I'm Gonna Recycle a Snitch

E6 | I Wanted Her to Hear It

E5 | Hell to Look Forward To

E4 | Heat Will Destroy

E3 | It Wanted to Kill Somebody

E2 | I Was in a Zone

E1 | I Guess My Life Is Over Now