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Predatory killers behave like animals in the wild; Jack Spillman, aka the Werewolf Butcher, drinks his victim's blood; Levi King ambushes a sleeping family with an assault weapon.

Most Evil

Predators

Egomaniacal killers think only of themselves and feel no remorse for their crimes; truck driver Robert Rhoades rapes and tortures hitchhikers in a chamber secreted in the back of his cab.

Egocentric Killers

Deceptive killers hide their true natures; Kendall Francois is considered a gentle giant until police find the eight bodies he has hidden; Doyle Kelley is convicted of murdering both of his wives.

Deceptive Killers

Fantasy killers imagine their crimes in detail; murderer Daniel Conahan lures men into the woods to torture them; Angela Sanford kills as part of a satanic ritual; Harvey Robinson stalks women, then rapes and strangles them in their homes.

Fantasy Killers

Policeman Gerard Shaefer rapes and murders his victims; serial rapist Richard Hooten strangles his 17-year-old neighbor to death; Wayne Adam Ford confesses to killing four women.

Sexual Deviants

Maksim Gelman stabs random people in New York City; serial killer Henry Lee Lucas confesses to unsolved murders; Joseph Paul Franklin murders at least 15 people.

Stone Cold Killers

Anything can set off a rage killer; beneath Gerald Stano's calm exterior lurks a mass murderer; Robert Lopez goes from obsessive love to blind rage; serial killer Bengamin Atkins targets vulnerable women on the streets of Detroit.

Rage Killers

Control freaks seek to gain power through murder; Ronald Gene Simmons goes on a killing spree; nurse Richard Angelo poisons patients in order to save them; a domineering father turns into a murderer.

Control Killers

Taylor Helzer orchestrates murders in the name of God; Sylvia White kills anyone in her way, including her 4-year old stepson; Wayne Henley lures teenagers to his mentor's home, where they are tortured raped and killed.

Manipulators

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A forensic psychiatrist uses a "scale of evil" to measure the evil found within deadly criminals.

S3 E7 | Deceptive Killers

E10 | Predators

E8 | Egocentric Killers

E7 | Deceptive Killers

E6 | Fantasy Killers

E5 | Sexual Deviants

E4 | Stone Cold Killers

E3 | Rage Killers

E2 | Control Killers

E1 | Manipulators