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

Police engage in a massive manhunt to find a killer on a murder spree of revenge, taking the lives of his girlfriend, cousin, and a man he considers a father figure. Once captured, he proclaims that he simply wants to be "heard."

When a young mother goes missing, her husband joins the search while police discover her dismembered body in a stack of bins.

A vehicle plows down a 75-year-old military veteran on a country road in an apparent hit-and-run. When a young man confesses to the crime, detectives quickly learn they've encountered a psychopath with an intense desire to thrill kill.

Detectives reveal an unrepentant psychopath capable of executing the love of his life.

Investigators unveil the execution of a loving family, done by a callous psychopathic killer.

An early morning fire inside an apartment complex reveals the dead bodies of a young woman and an infant boy.

Police first arrest a man for discharging a firearm and soon discover dead bodies inside his apartment.

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.

A young man's confession to participating in a plot to murder another teenager stuns police of Ocala, Florida. As detectives dig in, they uncover a sadistic plot involving a manipulative ex-girlfriend with the desire to kill.

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

A vindictive psychopathic wife murders her husband.

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.

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.

A psychopathic son wanting control murders his middle-aged parents.

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.

After a couple's murder, police find a fantasy killing by two psychopaths.

A husband becomes the prime suspect when his wife goes missing as police discovers his checkered past; lacking a body or evidence of foul play, detectives hope to gain a confession from a man they realize might be a cold-blooded psychopath.

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 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.

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.

Authorities grow concerned when a 25-year-old woman reports her 50-year-old father and 6-year-old daughter missing. Police discover their dead bodies and uncover the shocking truth she is a psychotic killer.

For over three decades, Albuquerque police struggle to solve three violent cold cases. After years of searching, the cases break wide open when officers pick up a man on a probation violation. and he soon reveals himself to be a homicidal psychopath.

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.

Weeks after an 18-year-old man's friend reports him missing, his clothing turns up burned in a trash can behind a suburban home. When witnesses lead investigators to a young man with a history of violence, they soon learn he had not worked alone.