A 50-year-old woman is found dead in her home. All that's left behind is a note that reads, "Chase me." But when detectives uncover the killer, they quickly discover they have come face to face with a remorseless psychopath.

Residents of a quaint village are terrified when a local innkeeper and two others are found brutally murdered. Detectives in Maine must follow the depraved killer into the woods at night as he leads them to where he killed and buried a fourth victim.

An unapologetic 14-year-old boy confesses to the murder of his best friend. Twelve years later, he's back in court with chance at a reduced sentence. Has this 26-year-old really changed? Or is he the same meticulous, cold-blooded killer he always was?

When police question a man in his pregnant ex-girlfriend and her young son's disappearance, they discover he has a terrifying capacity for violence. Later, a seemingly innocuous man searching for a missing girl could be a real-life monster.

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Death row inmate John Hummel agrees to a final interview weeks before his execution.

An arrogant woman believes she's committed the perfect crime. She is wrong.

Traits of psychopath lurk in us all, but for whom does it lead to murder?

A man calls 911 with his dying breath, and first responders arrive to find him brutally murdered, stabbed 59 times. When detectives question his best friend, they uncover a tangled, sick story of deception and jealousy that explodes in psychopathic rage.

A killer shoots a young woman dead in her boyfriend's Orlando apartment. Hours later, he turns up in a hospital bed 500 miles away with a gunshot wound and a bizarre story that unravels to reveal he's a lying, callous psychopath.

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.

Experts explore the anatomy of the key manipulative tactics of psychopaths.

A longtime nurse confesses to helping end the lives of numerous elderly patients at multiple nursing homes; detectives discover this is no angel of mercy; behind her unsuspecting persona lies a ruthless psychopath.

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.

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.

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

« Previous Ep. Next Ep. » Investigators search a farm for a missing man and find human leg bone on the property. The owner, Susan Monica, admits that her pigs ate her tenant alive, and he's not the only victim. A ruthless psychopath, Monica despises humans but loves her pigs.

A gunman shoots a man dead as he runs along a country road. First responders find a witness standing next to the body with a strange story to tell, and detectives will unravel the lies of a callous psychopath who takes out his frustrations in bloodshed.

When women kill, it’s shocking to many of us. However, female psychopaths may not be as rare as we imagine. We’ll examine some of the unique characteristics of female psychopathic killers, and explore the horrific crimes that they’ve committed.

Experts explore cases of psychopathic killers known as family annihilators.

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.

Every parent's worst nightmare is the possibility that their child has the same evil traits as the most heinous murderers.

A vindictive psychopathic wife murders her husband.

Terror rocks an Ohio town when a mother, her two kids, and a close friend vanish. Fearing foul play, investigators track down the prime suspect and uncover a house of horrors. Detectives find themselves dealing with a psychopath with a bizarre obsession.

Police catch a break on three St. Louis cold case murders when emerging DNA technology makes a match: a 73-year-old frail man whose harmless facade is hiding a vicious individual.