two-part model of the serial murderer's development. The first part outlines biological factors and concomitant psychological anomalies that can predispose individuals toward homicidal behavior. Then, in developing the second part of his model, Giannangelo describes how a traumatic environmental stressor may trigger a cyclical pattern of violent behavior in those persons predisposed to kill. Having constructed his archetype of the serial killer, the author concludes by suggesting how diagnostic tools could be constructed and employed by psychologists, criminologists, and law enforcement officials to recognize the serial killer and to arrest the cycle of violence.

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