JOURNAL OFINTERPERSONAL VIOLENCE/ September I986 Z :-t an identity. Althoughthis kind of crimehas existedthroughout history Lunde, neverbeen 6 1977!, thenumber ofsuch murdershas as high Ressleret al.,I985!. -=-'=: eg According tothe 1984 FBI UniformCrime Report, 22.1% ofmurders com- = .r mitted inthe reporting yearhad anunknown motiveas analyzedby law enforcement. Thisfigure takeson addedmeaning when it is comparedto =2: ii; earlier reportingfigures. In1976, murderswith anunknown motiverepre- . E2» sented 8.5% ofall murders, l7.8% in 198], and 22.1%in I984 or an increase of ¬ E? 160%in an 8-year period. Such seeminglymotiveless murderswere firstcovered extensivelyby the Z3 news mediawhen NewYork City's Son of Sam" killer David Berkowitz stalked victims,apparently chosenat random, and killed them with a .44 caliber pistol.Since thenthere hasbeen considerableattention to these types of murders.People fear becoming the nextrandom victimof theseviolent, often grisly crimes. %?>% Sexual homicide results from one person killing another in the context of 1%: power, control,sexuality, andaggressive brutality.The psychiatricdiagnosis of sexualsadism, sometimesapplied tothe victimizer, statesthat the essential g?» featureof this deviant behavior i.e.,paraphilia! is the in iction of physical % :: or psychological suffering on another personin order to achieve sexual excitement. It hasbeen difficultto gather dependable statisticson thenumber ofsexual 2: homicide victimsfor severalreasons: the ! victim is officially reportedas a homicide statisticand notas a rape assault Brownmiller,1975; MacDonald, §< 1971!, ! thereis a failure to recognizeany underlyingsexual dynamicsin a seemingly "ordinary" murder Cormier 8: Simons,I969; Revitch, 1965!, E; ! those agenciesthat investigate, apprehend, andassess the murderer often fail to share theirfindings, curtailingthe collectivepool ofknowledge on the subject Ressler,Douglas, Groth,8: Burgess,I980!, and ! conventional evidence of the crime s sexual nature may be absent. , When law enforcement officials cannot readily determine a motive for murder, theyexamine itsbehavioral aspects.In developing techniques for profiling murderers,FBI agentshave foundthat theyneed tounderstand the thought patterns ofmurderers in orderto make sense crimeof sceneevidence and victim information. Characteristics of evidence and victims can reveal much about the murderer's intensityof planning, preparation, and follow- through. Fromthese observations,the agents begin touncover themurderer s motivation, recognizinghow dependentmotivation is to thekiller's domi- nant thinking pattems. Inmany instances,a hidden, sexual motiveemerges, a motive that has its origins infantasy. The roleof fantasyin the motive andbehavior ofsuspects is an important factor inviolent crimes,especially sexualmurders Ressleret al., in press!.In the last20 years,the roleof sadistic fantasyhas been explored inseveral studies Brittain,I970; Reinhardt,1957; Revitch,1965, 1980;West, Roy,8c
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