Serial Killers

 Types of serial killers:

The FBI's Crime Classification Manual places serial killers into three categories: "organized", "disorganized" and "mixed"—offenders who exhibit organized and disorganized characteristics. Some killers descend from being organized into disorganized behavior as their killings continue. They will carry out careful and methodical murders at the start, but become careless and impulsive as their compulsion takes over their lives.

Organized/nonsocial offenders

Organized/nonsocial offenders usually have above average intelligence, with a mean IQ of 123. They often plan their crimes quite methodically, usually abducting victims, killing them in one place and disposing of them in another. They will often lure the victims with ploys appealing to their sense of sympathy. For example, Ted Bundy would put his arm in a fake plaster cast and ask women to help him carry something to his car, where he would beat them unconscious with a metal bar (e.g. a crowbar), and carry them away. Others specifically target prostitutes, who are likely to voluntarily go with a serial killer posing as a customer. They maintain a high degree of control over the crime scene, and usually have a solid knowledge of forensic science that enables them to cover their tracks, such as burying the body or weighing it down and sinking it in a river. They follow their crimes in the media carefully and often take pride in their actions, as if it were all a grand project. The organized killer is usually socially adequate, has friends and lovers, and sometimes even a spouse and children. They are the type who, when captured, are most likely to be described by acquaintances as kind and unlikely to hurt anyone. Some serial killers go to lengths to make their crimes difficult to discover, such as falsifying suicide notes, setting up others to take the blame for their crimes, faking gang warfare, or disguising the murder to look like a natural death. David Berkowitz, Ted Bundy and John Wayne Gacy are examples of organized serial killers.

Disorganized/Asocial Offenders

Disorganized/asocial offenders are often of low intelligence, have a below average IQ (<90), and commit their crimes impulsively. Whereas the organized killer will specifically set out to hunt a victim, the disorganized will murder someone when the opportunity arises, rarely bothering to dispose of the body but instead just leaving it at the same place where they found the victim. They usually carry out "blitz" attacks, leaping out and attacking their victims without warning, and will typically perform whatever rituals they feel compelled to carry out (e.g., necrophilia, mutilation, cannibalism, etc.) once the victim is dead. They rarely bother to cover their tracks but may still evade capture for some time because of a level of cunning that compels them to keep on the move. They are often socially inadequate with few friends, and they may have a history of mental problems and be regarded by acquaintances as eccentric or even "a bit creepy". Disorganized/asocial offenders also tend to be introverted. They have little insight into their crimes and may even block out memories of committing the murders.

Motives

The motives of serial killers are generally placed into four categories: "visionary", "mission-oriented", "hedonistic" and "power/control"; however, there is often considerable overlap among these categories.

Visionary

Visionary serial killers suffer from psychotic breaks with reality, sometimes believing they are another person or are compelled to murder by entities such as the devil or God. The two most common subgroups are "demon mandated" and "God mandated."

Herbert Mullin believed the American casualties in the Vietnam War were preventing California from experiencing an earthquake. As the war wound down, Mullin claimed his father instructed him via telepathy to raise the amount of "human sacrifices to nature" in order to delay a catastrophic earthquake that would plunge California into the ocean.

David Berkowitz is an example of a demon-mandated visionary killer. He claimed a demon transmitted orders through his neighbor's dog, instructing him to murder.

Mission-oriented

Mission-oriented killers justify their acts on the basis that they are getting rid of a certain type of person, such as homosexuals, prostitutes, blacks or Catholics, whom they find undesirable; however, they are not psychotic.

Hedonistic

This type of serial killer seeks thrills and derives pleasure from killing, seeing people as objects for their enjoyment. Forensic psychologists have identified three subtypes of the hedonistic killer: "lust", "thrill" and "comfort".

Lust

Sex is the primary motive of lust killers, whether or not the victims are dead, and fantasy plays a large role in their killings. Their sexual gratification depends on the amount of torture and mutilation they perform on their victims. They usually use weapons that require close contact with the victims, such as knives or hands. As lust killers continue with their murders, the time between killings decreases or the required level of stimulation increases, sometimes both.

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Kenneth Bianchi, one of the "Hillside Stranglers", murdered women and girls of different ages, races and appearance because his sexual urges required different types of stimulation and increasing intensity.

Jeffrey Dahmer searched for his perfect fantasy lover—beautiful and eternal. As his desire to find the perfect lover increased, he experimented with drugs, alcohol and exotic sex. His increasing need for stimulation was demonstrated by the dismemberment of victims, whose heads and genitals he preserved. He experimented with cannibalism to ensure his victims would always be a part of him.

Thrill

The primary motive of a thrill killer is to induce pain or create terror in their victims, which provides stimulation and excitement for the killer. They seek the adrenaline rush provided by hunting and killing victims. Thrill killers murder only for the kill; usually the attack is not prolonged, and there is no sexual aspect. Usually the victims are strangers, although the killer may have followed them for a period of time. Thrill killers can abstain from killing for long periods of time and become more successful at killing as they refine their murder methods. Many attempt to commit the perfect crime and believe they will not be caught.

Robert Hansen took his victims to a secluded area, where he would let them loose and then hunt and kill them. Lee Boyd Malvo and John Allen Muhammad, the DC Snipers, killed random victims, often at gas stations, shooting them and leaving the scenes unnoticed. In one of his letters to San Francisco Bay Area newspapers, the Zodiac Killer wrote "[killing] gives me the most thrilling experience it is even better than getting your rocks off with a girl".

Comfort

Material gain and a comfortable lifestyle are the primary motives of comfort killers. Usually, the victims are family members and close acquaintances. After a murder, a comfort killer will usually wait for a period of time before killing again to allow any suspicions by family or authorities to subside. Poison, most notably arsenic, is often used to kill victims. Female serial killers are often comfort killers, although not all comfort killers are female. Dorothea Puente killed her tenants for their Social Security checks and buried them in the backyard of her home. H. H. Holmes killed for insurance and business profits.

Power/control

Their main objective for killing is to gain and exert power over their victim. Such killers are sometimes abused as children, leaving them with feelings of powerlessness and inadequacy as adults. Many power/control-motivated killers sexually abuse their victims, but they differ from hedonistic killers in that rape is not motivated by lust but as simply another form of dominating the victim. Ted Bundy traveled around the United States seeking women to control.

Medical Professionals

Some people with a pathological interest in the power of life and death tend to be attracted to medical professions. These kinds of killers are sometimes referred to as "angels of death" or angels of mercy. One example is Harold Shipman, an English family doctor, who made it appear that his victims died of natural causes. Between 1975 and 1998, he killed at least 215 patients. Dr John Bodkin Adams, meanwhile, though acquitted in 1957 of the murder of one patient, is believed to have killed around 163 patients in Eastbourne, England.