Homicide and Serial Killers

Instrumental Violence: Purposeful aggression often aimed at gaining a specific goal.
Reactive Violence: Aggression that occurs in response to a provocation, typically characterized by emotional arousal.

Data Trends:
- Offenders and victims are typically males under the age of 25.
- Victims are often murdered by someone they know, such as acquaintances or family members.
- Less than ¼ of homicide cases involve strangers.
- Most homicides occur in private residences.
Precipitating Factors:
- Arguments are significant contributors to homicide rates in Canada and the U.S.
- In North America, substance abuse is a prevalent factor leading to violent incidents.

Overcontrolled Hostility Scale (O-H):
- A tool used to identify individuals who show signs of overcontrolling emotional responses.
- Distinguishes between highly assaultive and non-violent offenders.
- Findings indicate adolescent murderers have a higher O-H score compared to non-murdering peers.

Self-Regulation: The capacity to control emotional responses and select appropriate behavioral reactions to stimuli.
This ability plays a critical role in contributing to reactive forms of violence, specifically homicide.
Dysfunctional Regulation Types:
- Underregulation:
- Impulsive behaviors stemming from an inability to manage emotional responses, leading to aggressive acts.

Filicide: The act of killing a child by a parent.
- Gender Distribution: Men are equally likely as women to commit this form of murder, often under the influence of alcohol.
- Additional stressors such as unemployment and separation are commonly involved in these situations.
Neocide: Murder within 24 hours of birth.
Infanticide: Killing a child older than 24 hours, can be linked to factors like mental illness or psychopathy.
Conditions impacting filicide include:
- Poverty, social isolation, unemployment, lack of education, and rare postpartum psychosis, which includes delusional thinking and mood instabilities.
Parricide: Killing of a parent, more prevalent in male perpetrators.
- Adult perpetrators often suffer from mental illness and experience financial disputes.
- Juvenile cases typically involve ongoing abuse.
Matricide: The act of killing one’s mother.
Patricide: The act of killing one’s father.

Mass Murder: Defined as the killing of four or more individuals at one location.
Spree Murder: Previously used by the FBI to categorize multiple murders at different locations but is no longer officially recognized.
- Example: The movie Natural Born Killers, which depicts a couple murdering 11 individuals over an 8-day road trip.
Serial Murder: Involves the killing of at least two victims at separate times with a cooling-off period between murders.
- Example: Ted Bundy, who committed multiple murders over a timeframe of five years.

Research on female serial killers is limited; approximately 1 in 6 serial killers are women, complicating data collection and analysis.
Differences in Female Serial Killers:
- Females tend to be more “active” for longer periods, employing more discreet methods.
- Often referred to as the “quiet killers” who frequently use poison as their weapon of choice.
- Males are usually more violent and showy in their methods.
Female killers are more likely to target acquaintances or loved ones.
- Include the “black widow” killer (a wife who murders her husband) and the “angel of death” (female caretakers who kill their patients).
- Financial gain is a common motive for women committing homicide.

Organized Killer:
- Crime scene displays intelligence and emotional control.
- Exhibits social skills and maintains normalcy (e.g. Has a steady job, family).
- Crimes are premeditated and often involve bringing tools for the act such as handcuffs and rope.
- Victims are carefully selected, often stalked, and bodies may be moved to cover evidence.
Disorganized Killer:
- Exhibits social and sexual ineptness; usually possesses a below-average IQ.
- Lives alone and commits crimes closer to home, reflecting impulsive anger and chaotic murder scenes.
- Uses readily available weapons and often leaves evidence at the scene without an attempt to cover it up.

Visionary: Motivated by psychotic disorders.
Mission-oriented: Has a specific agenda, eliminating victims for a cause without being psychotic.
Hedonistic: Engages in thrill killings driven by pleasure, with a subset labeled as rape or lust killers (e.g. the Ice Man).
Power-oriented: Controls life and death scenarios, often stemming from an internal sense of inadequacy or powerlessness (e.g. Zodiac Killer).

MacDonald Triad: A behavioral syndrome involving three components that predict future violent behavior:
- Fire Setting: Often associated with conduct disorder.
- Cruelty to Animals: Frequently observed in violent offenders, indicative of conduct disorder.
- Bedwetting: Presentation of this behavior early in childhood is also linked to future violent tendencies.