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< definition of serial killer >

"A serial killer is typically a person who murders three or more people, in two or more separate events over a period of time, for primarily psychological reasons. There are gaps of time between the killings, which may range from a few days to months, or many years."

What makes a serial killer?

Many serial killers are victims of early childhood trauma of one kind or another - physical or sexual abuse, dysfunctional families, emotionally distant or absent fathers. Trauma is the common thread running through the lives of most serial killers. Because of this, they repress their feelings. They never learn how to respond appropriately to stress, and so they never develop any other emotions. This causes them to lack empathy, and to feel no connection to anyone else.

Why serial killer kill ?

Federal Bureau of Investigation (FBI) states that the motives of serial killers can include anger, thrill-seeking, financial gain, and attention seeking, and killings may be executed as such.

The victims may have something in common; for example, demographic profile, appearance, gender or race

How serial killer kill ?

The FBI's Crime Classification Manual places serial killers into three categories:

1. Organized 
2. Disorganized
3. Mixed

Organized:

Organized serial killers often plan their crimes methodically, usually abducting victims, killing them in one place and disposing of them in another. They often lure the victims with ploys appealing to their sense of sympathy. Others specifically target prostitutes, who are likely to go voluntarily with a stranger

Often, organized killers have social and other interpersonal skills sufficient to enable them to develop both personal and romantic relationships, friends and lovers and sometimes even attract and maintain a spouse and sustain a family including children. Among serial killers, those of this type are in the event of their capture most likely to be described by acquaintances as kind and unlikely to hurt anyone.

Disorganized:

Disorganized serial killers are usually far more impulsive, often committing their murders with a random weapon available at the time, and usually do not attempt to hide the body. They are likely to be unemployed, a loner, or both, with very few friends.

They often turn out to have a history of mental illness, and their modus operandi (M.O.) or lack thereof is often marked by excessive violence and sometimes necrophilia or sexual violence. Disorganized serial killers have been found to have a lower mean IQ than organized serial killers, at 89.4.

Mixed:

The Mixed serial killers, with both organized and disorganized traits, have an average IQ of 100.9, but a low sample size