When detectives find a woman bloodied and lifeless in her house, they reveal a psychopath reenacting a revenge fantasy inspired by a movie. S6/Ep10 [S]
When a family of five disappears during the Christmas holiday, investigators uncover a manipulative psychopath with a motive to annihilate his family. S6/Ep7
When local doctors in Bowling Green, Kentucky uncover a fake birth, detectives soon learn they are dealing with a violent, infant-stealing psychopath. S6/Ep9
When motorists discover the bodies of a man and woman along I-85, detectives uncover a psychopath with a penchant for guns and violent fantasies. S6/Ep11
When a retired mother of three vanishes after a night out with friends, detectives uncover a psychopath's nightmarish desires and a violent outcome. S6/Ep4
After someone brutally murders a 66-year-old disabled man, investigators identify a pair of psychopathic young lovers on the run as prime suspects. S6/Ep5
When a psychopath slaughters three generations of a loving family, investigators uncover a decades-old revenge plot driven by parasitic tendencies. S6/Ep1
A 17-year-old steals a gun and murders two gas station attendants in cold blood. When officers catch up with him, they come face-to-face with a psychopath. S2/Ep10
A gunman shoots a young man and woman on their way home from work. Detectives learn that this is no random attack but the twisted plan of a psychopathic stalker. S2/Ep9
When a student goes missing, the family he's staying with contact police. Then, a horrific discovery forces investigators to face a diabolical monster. S2/Ep8
A robber who feels compelled to turn himself in, calls 911. But when officers arrive at the scene, he confesses to much more than breaking and entering. S2/Ep7
Experts look at a sexual psychopaths, who are motivated by their heightened sexual urges and fantasies, enacting both physical and sexual violence. S5/Ep12
When an apartment fire reveals two dead bodies, detectives find a man who first appears polite and gentle, then later as a pawn of imagined demons. S5/Ep20
A Saint Paul, Minnesota, mother's disappearance rocks the city. When her dismembered body is found, the truth reveals evil lurking inside her home. S5/Ep13
In a brazen public execution, a killer guns down a young man in a car park. When police track down the suspect, they find a cold-blooded psychopath. S5/Ep16
After authorities struggle to solve three murder cases for 30 years, they arrest a local man who shockingly confesses, revealing a lethal psychopath. S5/Ep18
A remorseless psychopath who wants revenge against the people closest to him goes on a spree of murder and arson, proclaiming he wants to be heard. S5/Ep15
12 years after murdering his friend, a 26-year-old man requests a reduced sentence. Has he really changed, or is he still capable of cold-blooded murder? S1/Ep3
Three locals are found brutally murdered in a quaint village in Maine. The killer leads detectives into the woods, where he buried his fourth victim. S1/Ep2
When a 50-year-old woman is found dead in her home, all that's left behind is a note that reads, "Chase me." Police search relentlessly for the remorseless psychopath. S1/Ep1
In the small town of Ocala, Florida, a teenager falls victim to a young psychopath, a vengeful ex-girlfriend and a few of their delinquent friends. S5/Ep4
Police catch a break on three cold case murders when DNA technology makes a match. They interrogate a 73-year-old man who's been in prison since 1993. S5/Ep8
When a 19-year-old Colorado woman vanishes, the suspect is her troubled former classmate who has a past filled with homicidal urges toward women. S4/Ep9
An 18-year-old man is reported missing in North Dakota. Witnesses lead police to a young man with a history of violence, who didn't work alone. S4/Ep13
Experts delve into disturbing cases of psychopathic killers known as "family annihilators," who see family members as simply potential victims. S4/Ep11
Investigators search a farm for a missing man and find human remains. The owner admits that her pigs ate her tenant alive, and he's not the only victim. S3/Ep17
A racially motivated serial killer, who targeted civil rights leader Vernon Jordan and pornography publisher Larry Flynt, confesses to further murders. S3/Ep18
A woman finds her brother dead in his bedroom with his throat slashed. The individual responsible is a manipulative psychopath who craftily deflects blame. S3/Ep16
The signs of psychopathy lurk in all humans - grandiosity, sadism, superficial charm, manipulation, lack of empathy, or having a parasitic lifestyle. S3/Ep11
A gunman shoots a young man and woman on their way home from work. Detectives learn that this is no random attack but the twisted plan of a psychopathic stalker. S2/Ep9
A gunman shoots a young man and woman on their way home from work. Detectives learn that this is no random attack but the twisted plan of a psychopathic stalker. S2/Ep9
A missing woman's brutally beaten body is found in a dilapidated house near her home. The case goes cold until a local teen makes a sickening claim. S3/Ep8
A mother is found dead after reporting her son to the police. When he turns himself in, his confession isn't just cold-hearted, it's psychopathic. S3/Ep6
A woman's body is found strangled near a country road. Investigators learn the suspect is a prolific serial killer who raped and murdered eight women. S1/Ep11
When a beloved elderly couple disappears, detectives discover their son not only lived off their charity but also took sadistic pleasure in murdering them. S3/Ep1
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. S3/Ep3
A man confesses he "accidentally" killed his best friend while cleaning his gun. During his interrogation, he admits to police he's a serial killer. S3/Ep9