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é} | THE FORUM The Forum presents major reviews of empirical research, theoretical conceptual formulations, or manuscripts of major significance to the field. The findings from this exploratory study are reported in terms of the descriptive background characteristics of 36 sexual murderers, their behaviors and experiences in connection with their developmental stages, and the central role of sadistic fantasy and critical cognitive structures that support the act of sexual murder. A five-phase motiva- tional model is presented: (1) ineffective social environment, (2) formative events, (3) critical personal traits and cognitive mapping process, (4) action toward others and self, and (5) feedback filter. Sexual Homicide A Motivational Model ANN W. BURGESS University of Pennsylvania CAROL R. HARTMAN Boston College ROBERT K. RESSLER JOHN E. DOUGLAS FBI Academy ARLENE McCORMACK University of Lowell For many years, motiveless murder has baffled law enforcement officials and mental health professionals (Satten, Menninger, Rosen, & Mayman, 1960). Motiveless killings, usually serial in nature (carried out by a single individual over a period of time), leave virtually no clues about the murderer's motive or Authors’ Note: Preparation of this article was supported by Depar:ment of Justice grants: Office of Juvenile Justice and Delinquency Prevention (#84-JN-K010) and National Institute of Justice (#82-CX-0065). We wish to acknowledge gratefully Allen G. Burgess, Marieanne L. Clark, and Mary Francis Jett for contributions to this article. JOURNAL OF INTERPERSONAL VIOLENCE, Vol. | No. 3, September 1986 251-272 © 1986 Sage Publications, Inc. 39