This paper explores the psychology and behavior of serial killers, drawing on criminological scholarship to analyze the factors — biological, environmental, and mixed — that contribute to serial homicide. It distinguishes serial killers from spree killers and mass murderers, reviews nature-versus-nurture frameworks for explaining criminal behavior, and examines the role of modus operandi and criminal profiling in law enforcement investigations. Two detailed case studies — Albert DeSalvo (the Boston Strangler) and Kenneth Bianchi and Angelo Buono (the Hillside Stranglers) — illustrate how behavioral patterns are identified and used to apprehend offenders.
The paper demonstrates effective use of definitional framing: before analyzing any case, the author carefully defines key terms (serial killer, modus operandi, criminal profiling) using cited scholarly sources. This technique establishes a shared vocabulary and signals academic rigor, ensuring that subsequent claims rest on an explicit conceptual foundation rather than assumed common knowledge.
The paper opens with an introduction establishing scope and public interest, then moves through three analytical sections — behavioral motivation, influencing factors, and profiling methodology — before transitioning to two parallel case studies. A brief conclusion ties the analytical framework back to real-world implications for law enforcement and public safety. This funnel structure (theory → application) is well-suited to criminology essays at the undergraduate level.
Serial killers have struck fear in the hearts of people, yet the public remains fascinated and intrigued by the crimes these individuals perpetrate. Several theories and factors have been attributed to serial killers in an attempt to explain their behaviors. Furthermore, by identifying the behaviors exhibited by serial killers, law enforcement professionals are able to gather information that assists in the apprehension of the criminal.
In the majority of serial homicides, a motivating factor — in addition to domination and manipulation of a victim — is the sexual gratification and desire experienced by the serial killer. Serial killers murder individuals because they believe and feel that the act will fulfill them, and they will continue to murder people as long as they can (Douglas 191). The definition of a serial killer may be distinguished from that of a spree killer and/or mass murderer through a variety of factors. Whereas a spree killer will murder a number of victims at different locations over a short period of time, and a mass murderer will play an endgame strategy in which he or she does not expect to survive, a serial killer hunts humans primarily for the sexual thrill derived from the act (14).
It is not often that law enforcement officials and behavioral scientists are able to get a first-hand glimpse into the world of a serial killer while attacks are taking place (Arrigo 98). One factor that may prevent law enforcement officials and behavioral scientists from observing serial murders in real time is the cooling-off period often exhibited by these criminals. Because a serial killer commits murders on at least three separate and distinct occasions, the cooling-off period between each crime may last days, weeks, months, or even years (Douglas 190).
Serial killers may also be divided into three different categories: the serial murders of patients by nurses and doctors, the murders of random strangers over long periods of time, and serial sexual homicide (Stone 196). Michael H. Stone, in The Anatomy of Evil, contends that several factors influence a serial killer's behavior. These factors are presented in a nature-versus-nurture paradigm, with some falling into a category of mixed and/or unknown origins (201).
The factors Stone considers pertaining to an individual's natural environment include mental illness coupled with psychosis, schizophrenia, manic-depression, autism, and Asperger's Syndrome. Also included among natural factors are mental illnesses without psychosis — such as ADD and ADHD — as well as alcoholism, epilepsy, and an inordinate sexual drive (201). Personality disorders are considered inherent to an individual and therefore part of one's natural environment; these include antisocial, psychopathic, schizoid, sadistic, paranoid, and/or impulsive-aggressive personalities (201).
Stone identifies nurture-based factors as parental physical, sexual, or verbal abuse; parental abandonment and/or neglect; the loss of a parent; absence of a father; separation and/or divorce of the parental unit before the child turns 16; and brain disease or damage (201). Factors attributed to mixed or unknown origins include paraphilia, juvenile delinquency, substance abuse, alcoholism, conduct disorders committed in childhood, animal torture and arson, and rape or other sexual offenses committed in adolescence (202). FBI statistics reveal that at least "42% of serial killers have suffered severe physical abuse as children, 43% were sexually molested, and a full 74% were subjected to ongoing psychological torture" (Schechter 293).
Serial killers often develop a pattern of behavior and actions that can help law enforcement officials observe and predict future conduct. The modus operandi, or MO, is present in most — if not all — of their victims and helps law enforcement officials identify the type of serial killer an individual may be (Arrigo 232). A modus operandi is defined as "repeated patterns of behaviors which are unnecessary to the commission of the crime; provide psychosexual arousal and gratification; and complement the motive" (232). It is unusual for a serial killer to completely change their MO; however, there is evidence that killers will alter or adapt their MO to better suit their needs.
Criminal profiling is useful and beneficial in helping to apprehend serial killers. Criminal profiling is "the process of inferring distinctive personality characteristics of individuals responsible for committing criminal acts" (Turvey 1). It can also be referred to as psychological profiling, investigative profiling, or crime scene analysis (Arrigo 232). The chief aim of criminal profiling is to determine a criminal's signature, often a component of their MO.
A series of serial killers identifiable by their MO are the Boston Strangler and the Hillside Stranglers, both of whom strangled their victims to death. According to Vernon Geberth, the Commanding Officer of the Bronx Homicide Task Force, strangulation is one of the most intimate and personal of murders because the killer literally holds the victim's life in their hands; strangulation gives the killer a sense of control over the situation (Geberth).
By understanding and studying criminal behavior, law enforcement officials are able to infer future behaviors and hopefully prevent future crimes from occurring. Criminal profiling helps professionals assess the dangers posed by criminals and contributes to making society a safer place.
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