Dr. Stone's scale of evil has decoded the complex psychology of the country's most notorious criminals. But can it be used to reveal new clues for unsolved crimes? Cold cases, including that of the infamous Black Dahlia, will be reopened as Dr. Stone profiles killers who may still be at large. He'll venture into prison to meet face-to-face with alleged Lipstick Murderer Bill Heirens.

In the wild, a predator instinctively knows: eat or be eaten. For predator killers, murder is just as natural. Jack Spillman proved his bestiality by drinking his victim's blood. Levi King ambushed a sleeping family with an AK-47.

Sexual deviants are aroused by the act of murder. Gerard Shaefer was a trusted policeman who bound, raped and murdered his victims. Richard Hooten was a serial rapist who went after his neighbors. And Wayne Adam Ford killed at least 4 women for pleasure.

Three master manipulators. Each committed acts of unspeakable evil...Taylor Helzer orchestrated brutal murders in the name of God. Sylvia White killed anyone she felt was in her way...including her four-year old stepson.

The attention-seeking killer commits crimes for the spotlight it incurs. George Russell boasted of his importance, ultimately killing the women whose attention he could never get. Eddie Seda jumped on the coattails of the famed Zodiac killer.

Stone cold killers attack without a moment's hesitation. Maksim Gelman stabbed random strangers throughout New York City. Henry Lee Lucas was a barbaric necrophiliac who claims to have killed hundreds. And Joseph Paul Franklin killed at least 15 people.

Control freaks seek to gain power through murder. Ronald Gene Simmons was a mass murderer who killed 16 people. Richard Angelo was a nurse who poisoned patients to save them. Billie Wayne Coble was a domineering father, and murderer.

Over the last few decades, spree killings and mass murders have been on the rise. So-called "rage killers" are different from serial murderers, their anger building until they turn it loose on society, killing as many people as they can in a very short period of time. What links these acts of evil? From Charles Whitman, the Texas clock tower sniper, to Charles Starkweather, the real "Natural Born Killer," science reveals new clues into the psychology behind these seemingly senseless crimes.

antasy killers imagine every aspect of their crime in detail. Daniel Conahan lured men into the woods to torture them. Angela Sanford killed as part of a satanic ritual. And Harvey Robinson stalked women, then raped and strangled them in their homes.

Ego Maniac killers think only of themselves, and thus commit egregious crimes without remorse. Truck driver Robert Rhoades raped and tortured hitchhikers in a specially designed chamber in the back of his cab.

What lies in the mind of the psycho killer? Ed Gein robbed graves to harvest the skin of his victims. Arthur Shawcross strangled prostitutes and ate their remains. Gary Heidink tortured six women in his basement for months. In each case, these killers claimed they were unaware of what's real and what's imagined. What triggered their violence? To understand their atrocities, we will examine the real science of psychosis and meet one of these killers face to face.

The most notorious killers -- Bundy, Gacy, Ridgway, Sells -- have claimed hundreds of victims and share one thing in common. They are all psychopaths. It is estimated that one in every 100 people is a psychopath. But what pushed these psychopaths into serial murder? Was it nature or nurture? To understand their savage brutality, we will travel back into their childhoods, reveal startling new scientific research about psychopaths and meet one of these killers face to face.

Gangs. They lure members with promises of respect, money and power. From armed robbery to murder, they are responsible for some of the most brutal crimes. What drives gangsters to kill? Forensic psychiatrist Dr. Michael Stone examines the world's deadliest gangsters, delving into the cases of psychopathic mafia hitman Richard Kuklinski; Paul and Herman Petrillo, who operate a deadly Philadelphia murder ring; Ervil LeBaron, a polygamist Mormon leader who runs his church like the mafia; and Ismael Cisneros, whose affiliation with street gang MS-13 leads him to murder one of his best friends. Dr. Stone speaks face-to-face with Joseph Salcedo, a Los Angeles gangster whose participation in a retaliatory murder landed him behind bars. Using his scale of evil, Dr. Stone analyzes each killer's vicious acts to determine who is most evil.

What happens in the mind of jealous lovers turned into enraged killers? From impulsive crimes of passion to the terrifying revenge spree of Andrew Cunanan, killer of world-famous fashion designer Gianni Versace, Dr. Stone unravels how the psychology of love can become the psychology of murder. The FBI deputy director who led the Cunanan manhunt, leads viewers through his search for an unstoppable killer consumed by jealous rage.

Some killers seek credit for their crimes. They play cat-and-mouse games with police, leave calling cards at crime scenes, and even send letters to newspapers. In each case, the quest for infamy leaves a devastating trail of destruction. From New York City's infamous "Son of Sam" to the terrifying spree of the DC Snipers, what causes some people to choose murder as a means to notoriety? With groundbreaking science on the origins of malignant narcissism, Dr. Stone profiles three murderers whose need for glory and control led them to incredible evil.

The most intelligent serial murderers can be the most dangerous. Edmund Kemper, Unabomber Ted Kaczynski, and Randy Kraft all showed genius-level IQs, and their extraordinary intellect allowed them to kill for years-sometimes decades-without getting caught. What lies at the intersection of evil and intelligence? Dr. Stone, armed with new scientific discoveries on early brain development, analyzes Kemper, Kaczynski, and Kraft to find out what made these killers' use their cunning for crime.

Anything can set off a rage killer. Gerald Stano craved the company of women but lashed out when he felt he was being mocked. When Robert Lopez found a girlfriend, he flipped a switch between obsessive love and blind rage.

Engineers of the most diabolical plots; killers with the most deviant desires -- Columbia University forensic psychiatrist Dr. Michael Stone explores the murderous world of these deviant killers to find out how their desires form and what drives them to carry out their fantasies. The killers featured include Jerome Brudos, whose deviant desires started with a shoe fetish as a young boy, and ended with the brutal murder and mutilation of four women as an adult; and Jeffrey Dahmer, who infamously tortured, murdered and mutilated 17 men and boys.

What happens when delusion, obsession, and jealousy collide? Violent stalkers are among the most terrifying criminals, preying on victims with a chilling determination. What can explain this relentless drive, and what triggers violence in the mind of a stalker? Neuro-psychology is explored on the cases of four notorious stalkers, to provide insights into the science of deadly obsession. Robert Bardo, killer of television actress Rebecca Schaeffer, speaks from prison to give Dr. Stone his first-person account of the crime.

Scheming killers. Liars and con artists who deceive their families, their friends and the public. They use their intelligence to get away with murder. What drives these manipulating minds and who is most evil? Dr. Michael Stone is evaluating the cases of individuals who have planned and schemed to commit heinous crimes. Diane Downs blames a hitchhiker for shooting her children, but a surviving daughter says her mother pulled the trigger. Michael Swango was a brilliant doctor with a dark fascination. He is suspected of killing up to 60 patients. John Robinson fooled his family and community into thinking he was an upstanding citizen and entrepreneur. In reality, he was profiting from the deaths of vulnerable women. Dr. Stone then travels to Georgia to interview Martha Ann Johnson, who was convicted of killing her daughter in an attempt to get her husband back. How do schemers fool the people around them and what makes them different from other killers?

Deceptive killers walk among us wearing a mask of innocence. Everyone thought janitor Kendall Francois was a gentle giant... until police found the eight bodies he'd hidden. Doyle Kelley was convicted of murdering his first...and second wives.

"Killer Lies" looks at recent history's most deceptive killers, including Susan Smith, who claimed her sons had been kidnapped, and John List, who slaughtered his family and then mysteriously disappeared. From Nathan Bar-Jonah, a suspected cannibal-murderer, to the notorious BTK killer, we'll examine these criminals who terrorized their own communities. With breakthrough imaging science, we will peer into the minds of these impulsive liars and serial predators to explore why deception is such a dangerous weapon in the hands of the most evil.

Revenge is one of the more common motives for murder. Much less comprehensible and much more dangerous are killers who are not content with eliminating the object of their hatred. Seeking out anyone who reminds them of the enemy, they kill again and again. "Mad Dog" McCafferty killed three people to avenge his son's death. Anatoly Onoprienko, abandoned in an orphanage by his father, sought out revenge on any happy family he encountered. What accounts for violent vengeance? Dr. Stone probes the science of revenge to profile these killers, looking for clues that might shed light on their motives.

Even with a mix of narcissism, paranoia, and undeniable charisma, cult leaders normally don't become violent. But when they do, the consequences can be staggering. With an army of loyal followers at their command, they have the power to act out their most deluded fantasies on a scale that rivals the worst serial killers. Analyzing three of 20th century's most deadly cult leaders, Dr. Stone investigates. Vincent Bugliosi, the man who prosecuted Charles Manson, explored one of the world's most shocking crimes, and into the mind of a notorious murderer.

Featuring cutting-edge science that may finally reveal the neurological cause of violent schizophrenia, three delusional minds are profiled. Though most schizophrenics never become violent, some of the world's most notorious crimes have involved people whose bizarre breaks from reality have pushed them to murder. Some, like Bob Mullin, who killed 13 people, even hear voices commanding them to kill.