Commuters and marauders: an examination of the spatial behaviour of serial criminals

The demographic characteristics of serial offenders that distinguish between the commuter and the marauder offence styles were examined. Proposed by Canter and Larkin (1993) these two styles represent competing models of criminal spatial behaviour under which the home base plays a role in offence site selection. Data on serial burglars, arsonists and sex offenders were extracted from the criminal records maintained by the NSW Police Service. The offence style of each offender's crime series was identified in order to relate the offence style to the demographic variables, and to examine the offender's first and last offences in a series. A commuter offence style was more likely to be adopted by burglars and generally by adult males. A marauding offence style was apparent in sex offenders and metropolitan based offenders. There was a progression in the distance travelled to offend across all crime types, as the last offence was located further from the home base by comparison with the first. These findings serve to validate the conceptual distinction between commuter and marauder offence styles. Several implications for further research are addressed. Copyright © 2004 John Wiley & Sons, Ltd.     

How does crime pay? The differentiation of criminal specialisms by fundamental incentive

Most attempts to determine offence specialisms have not benefited from any formal psychological framework of behavioural differentiation. Bandura's framework (Social foundations of thought and action, 1986) of the fundamental incentives to human action offers an interesting perspective on what might underlie differential patterns of offending. The framework draws attention to the distinction between Material, Power/Status, and Sensory incentives, leading to the hypotheses that crimes which share any one of these incentives will be more likely to be committed by the same person, as revealed through high inter‐correlations, but be less highly correlated with crimes with different fundamental incentives. To test these hypotheses the correlations between 42 offending behaviours as self‐reported by 185 convicted young offenders were examined. A Multidimensional Scaling analysis of the inter‐correlations revealed three distinct styles of offending that could be related to Bandura's Material (Cronbach's α = 0.94), Power/Status (α = 0.90) and Sensory (α = 0.76) incentives. The identification of this psychological basis for the differentiation of criminal styles provides a model for considering offenders' patterns of specialisation which is of value both in clarifying the aetiology of different types of crime and in considering which crimes may be behaviourally equivalent when trying to link them to a common offender or infer offender characteristics from crime scene information. Copyright © 2006 John Wiley & Sons, Ltd.     

Pathways in the offending process of sex offenders who target marginalised victims

Prior literature shows that although marginalised populations are at a high risk of severe violence and homicide, research has focused on their offenders as if they constituted a homogeneous group. On the basis of a sample of 213 sex offenders who targeted marginalised individuals (i.e., sex trade worker, homeless individual, and severe drug user), we investigate the different pathways that these offenders take both prior to and during the commission of their crimes. Results of 2‐step cluster analysis regarding the offender's development, criminal history, crime context, and modus operandi revealed 3 distinct pathways of the offending process. The coercive pathway was characterised by the amount of violence used against the victim. The explosive pathway was defined by offenders who were in a state of rage at the time of the offence. Finally, offenders in the situational pathway committed their crimes out of opportunity and used very little violence. Differences between pathways were investigated with regard to characteristics of the index offence.     

Lessons from serial murder in South Africa

The systematic study of serial murder in South Africa is a newly developed field. This research demonstrates the similarities and differences between South African serial murderers and those found elsewhere. The most marked difference is the higher incidence of cross‐ethnic offending, the lower rate of ‘team killers’, and the lack of female serial murderers in South Africa. South African offenders display similar geographical behaviours to foreign serial murderers. Overall, South African offenders display more behaviour in common with their non‐European counterparts than serial murderers from the USA. South African serial murderers display certain diagnostic and developmental features that are different from those reported in North American serial murderers. Of these, the most notable is the seeming lack of sexually violent conscious fantasy. There are also fundamental similarities in experience: exposure to traumatic experiences, and profound interpersonal isolation and distance. This ambivalence is also noted in discussions of the evolution of behaviour in the offences, and in the discussion of motives in serial murder. This demonstrates areas that previous studies of serial murder need to explore further. This study also highlights the need for research into the ways in which offence behaviours are affected by the social environment. Finally, the analysis of serial murderers in South Africa suggests ways in which serial murder can be tackled. Copyright © 2004 John Wiley & Sons, Ltd.     

Escalation from Fetish Burglaries to Sexual Violence: A Retrospective Case Study of Former Col., D. Russell Williams

Criminal history narrative studies reveal an escalation in sexual offender behaviour from non‐contact to contact offending, with an ever‐increasing likelihood of sexual violence and homicide. In particular, researchers have found that sexual offenders often have a history of committing burglaries prior to contact offences. Accordingly, researchers have suggested that burglaries may be associated with an increased likelihood of future sexual offending, particularly when they have a sexual element to them. However, to date, there has been little quantitative research focusing on the mechanisms of escalation in sexual offences. This paper seeks to study factors associated with sexual offence escalation in terms of changes in offence seriousness and frequency. Specifically, case evidence was gleaned from a series of fetish burglaries and subsequent sexual assaults and murders committed by the former Canadian Colonel David Russell Williams (RW). Cluster analysis, chi‐square, ANOVA, and regression analyses were conducted on the crime scene information of RW's 82 cases of fetish burglary. Analyses revealed a significant escalation in the frequency and seriousness of RW's fetish burglary offences prior to committing acts of sexual violence and ultimately sexual homicide. Recommendations for future research predicting escalation of sexual offending by frequency and seriousness of offending behaviour are discussed. Copyright © 2013 John Wiley & Sons, Ltd.     

The relationship of offending style to psychological and social risk factors in a sample of adolescent males

Research has indicated that life‐course persistent offenders typically vary their offending style, following a criminal career progression from co‐ to solo‐offending. Few studies have investigated the offenders who contemporaneously mix their style of offending. A sample of 1,047 male adolescent offenders from the Pathways to Desistance study was investigated over a 7‐year period. Participants were identified as solo, co or contemporaneous mixed style (CMS) offenders for each wave of data and one‐way between groups analysis of variance was conducted to examine variations between the different offending styles in terms of offending frequencies, exposure to violence, peer antisocial behaviour and influence, resistance to peer influence, impulse control and psychopathy. CMS offenders were found to consistently report significantly higher rates of offending and present significantly higher negative risk factors and lower protective risk factors than solo‐ and co‐offenders for the duration of the study. A multinomial logistic regression was used to investigate predictors of offending style with CMS as the reference category. Higher levels of exposure to violence and peer antisocial behaviour and lower levels of impulse control predicted membership of the CMS group for the first part of the study when compared with co‐offenders; and higher levels of exposure to violence and peer antisocial behaviour continued to predict CMS offending when compared to solo‐offenders until the end of the study.     

Variations in the Journey from Crime: Examples from Tiger Kidnapping

The current paper explores the journey offenders make after their offence through a series of tiger kidnap offences from the north and south of Ireland. Tiger kidnap is the abduction of a person of importance to a victim (generally a bank manager) in which that person is used as collateral until the victim complies with the requests of the offenders. Data were provided by the Police Service of Northern Ireland and An Garda Siochana. Three stages of the offences were highlighted: (1) the journey from the abduction location to the hostage location; (2) the abduction location to the robbery location; and (3) the robbery location to the money exchange location. Analysis found significant difference between offences in the north and south for stages 1 and 2 but not for stage 3. This is due to the type of offenders committing the offence, for example, offences in the north being committed by ex‐paramilitary offenders. Further study should focus on understanding complex tiger kidnap offences. Copyright © 2016 John Wiley & Sons, Ltd.     

From marine ecology to crime analysis: Improving the detection of serial sexual offences using a taxonomic similarity measure

Jaccard has been the choice similarity metric in ecology and forensic psychology for comparison of sites or offences, by species or behaviour. This paper applies a more powerful hierarchical measure—taxonomic similarity (Δ_s), recently developed in marine ecology—to the task of behaviourally linking serial crime. Forensic case linkage attempts to identify behaviourally similar offences committed by the same unknown perpetrator (called linked offences). Δ_s considers progressively higher‐level taxa, such that two sites show some similarity even without shared species. We apply this index by analysing 55 specific offence behaviours classified hierarchically. The behaviours are taken from 16 sexual offences by seven juveniles where each offender committed two or more offences. We demonstrate that both Jaccard and Δ_s show linked offences to be significantly more similar than unlinked offences. With up to 20% of the specific behaviours removed in simulations, Δ_s is equally or more effective at distinguishing linked offences than where Jaccard uses a full data set. Moreover, Δ_s retains significant difference between linked and unlinked pairs, with up to 50% of the specific behaviours removed. As police decision‐making often depends upon incomplete data, Δ_s has clear advantages and its application may extend to other crime types. Copyright © 2007 John Wiley & Sons, Ltd.     

Comparing serial homicides to single homicides: A study of prevalence,offender, and offence characteristics in Sweden

Multiple and serial homicides constitute around 1.6% of all homicides but have unusually tragic outcomes. The aims of this study were to report the prevalence serial‐homicide offences and the characteristics of serial‐homicide offenders in a non‐North American context. The study included all convicted serial‐homicide offenders in Sweden from 1973 to 2012 (n = 25), as well as a population‐based control sample of single‐homicide offenders collected during 2007 and 2009 (n = 201). Similar to U.S. findings, approximately 1.6% of homicides could be attributed to serial‐homicide offenders. Serial offenders were more often diagnosed with personality disorders and autism‐spectrum disorders compared with single offenders; and serial offences more often involved victims who were female and unacquainted with the offender, as well as planning, sexual motives, and asphyxia as method of violence. One third of serial offences involved actions aimed at disguising the manner of death; such actions were considerably less common in single‐homicide offences. Few offenders displayed the traditional profile of a serial‐homicide offender; however, one third displayed sexual motives, a rate roughly 10 times higher than that in the single‐homicide group. The study concludes that serial‐homicide offenders should be subjected to forensic‐psychiatric examinations and that research involving cross‐contextual differences and similarities in serial‐homicide offenders is needed.     

Improvement of Thematic Classification in Offender Profiling: Classifying Serbian Homicides Using Multiple Correspondence,Cluster, and Discriminant Function Analyses

This paper investigates thematic classification of homicides for the purpose of behavioural investigative analysis (e.g. offender profiling). Previous research has predominantly used smallest space analysis (SSA) to conceptualise and classify offences into thematic groups based on crime scene behaviour data. This paper introduces a combined approach utilising multiple correspondence analysis (MCA), cluster analysis (CA), and discriminant function analysis (DFA) to define and differentiate crime scenes into expressive or instrumental and impersonal or personal crimes. MCA is used to derive the latent structural dimensions in the crime data and produce quantitative scores for each offence along these dimensions. Two‐step CA was then utilised to classify offences. Offence dimensional scores were then used to predict cluster membership under DFA, producing cluster centroids corresponding to MCA dimensions. Centroids were plotted on the MCA correspondence map to simultaneously conceptualise crime classification and the latent structure of the Serbian crime data. Classification of offences based on MCA dimensional scores were 91.5% accurate. This MCA–CA–DFA approach may reduce some of the more subjective aspects of SSA methodology used in classification, whilst producing a product more amenable to objective and cumulative review. Implications for offender profiling research utilising SSA and this approach are discussed. Copyright © 2014 John Wiley & Sons, Ltd.     

Offender and crime characteristics of female serial arsonists in Japan

This study of Japanese female serial arsonists examined their crimes and background characteristics. The data were a sample from the national police register containing arson cases resulting in charges in Japan between 1982 and 2005. Serial arsonists were 6% of the arson offenders and 12% of these were female, resulting in 83 female serial arsonist data sets. The mean age was 37.6 years and 43% were unemployed. Nearly half were married. Only 28% had a documented history of mental problems and 22% had a prior arrest, usually for theft (19%). Female serial arsonists are characterised by going to a place near their home with a lighter and setting fire directly to combustible materials. Non‐metric multidimensional scaling was used to analyse 33 variables related to the offences. The arsons could be differentiated in terms of either expressive or instrumental sources of action. Expressive arsons were opportunistic and impulsive acts, motivated by emotional distress. The fires were mostly set close to home. Expressive arsons were characteristic of 66% of the females. Instrumental arsons were often motivated by revenge and involved planned and goal‐directed behaviours. They were committed by 13% of the females. Instrumental arsonists tended to travel further from home. Copyright © 2007 John Wiley & Sons, Ltd.     

Sexualdelinquenz bei Schizophrenie

Studies suggest a complex relationship between schizophrenia and sexually offensive behaviour. This study aimed to preserve first findings of sex offence features and behaviours exhibited by psychotic men in Germany. Furthermore a typology of the schizophrenic offender group was developed. A comparative trial design was used to differentiate the psychotic and non psychotic offender group. A checklist was developed and applied to the records of 64 male restricted hospital order in-patients in Berlin with an index conviction for a contact sex offence against a woman. Social isolation, antisocial behaviour, psychosexual variables and adverse childhood experiences are found for schizophrenic and sexual offenders in general. Different sexual offensive behaviours appeared in the schizophrenic subgroups. Negative symptoms of schizophrenia as well as antisocial traits had a great impact on schizophrenic sexual offending. A heterogeneous group of psychotic offenders can be supposed.     

South African Serial Homicide: A Victim‐Focused Behavioural Typology

This current study assessed the value of the Interpersonal Model in differentiating serial homicide offences in South Africa, notably in terms of how the offender may display behavioural patterns that are indicative of them dealing with the victim as a Person, an Object, or a Vehicle. The sample consisted of 302 offences committed by 33 offenders that occurred from 1953 to 2007 in South Africa. Multidimensional scaling analysis was used to test the Interpersonal Model and results indicated that crime themes did not directly correspond to the threefold model. Instead, two crime scene types were present: Victim as Object (where the focus was on tangible gains, interaction with the victim throughout the phases of the crime was limited, and victims included men and live women) and Victim as Vehicle (where the victim might be construed as a conduit through whom the offender could realise their specific psychological needs, the interaction was extensive, and victims tended to be vulnerable). South African serial homicides did not appear to have a specific sub‐theme of Victim as Person, suggesting that the themes engaged in centred more on instrumentally focused actions but in qualitatively different ways. However, victim types were integral to the overall behavioural model. Using the Victim as Object/Vehicle dichotomy, 85.7% of the offences could be seen to engage dominantly in one of the two patterns at the crime scene. This not only supported the results of a twofold model, but having these many offenders showing a dominant crime scene type also shows that the model is an excellent representation of serial homicide offending in South Africa. Copyright © 2014 John Wiley & Sons, Ltd.     

South African Serial Homicide: Consistency in Victim Types and Crime Scene Actions Across Series

Key to understanding the significance of behavioural evidence for linkage purposes is in establishing how consistently an offender displays the same or similar behaviours across their series. There have however to date been very few studies aiming at identifying salient components of offending behaviour that can be used reliably for linking individual crimes as part of a single series. In addition, studies that have been conducted have all dealt with serial homicide in the Western world and have been based on small samples of cases from each country. Some of the recent literature has started to disentangle some of these salient features, notably the victim, violence levels, control, and planning. The current study focused on evaluating the consistency of these features across series, using a sample of serial homicides from South Africa consisting of 30 offenders with a total of 283 victims and 235 crime scenes. Results indicate that the level of interaction with the victim may be influential to the stability or instability of offending patterns across the series. How offenders approach planning in their offence also showed a certain degree of consistency, with patterns of violence being the least consistent across the series of all components tested. Copyright © 2014 John Wiley & Sons, Ltd.     

Behavioural Profiles and Offender Characteristics across 111 Korean Sexual Assaults

Although the potential usefulness of the offence action–offender characteristic (A–C) relationships is widely accepted and operational ‘offender profiling’ units now exist around the world, few such relationships have been empirically established. To explore this, the offending action patterns within 111 sexual assault cases from South Korea were coded in terms of 16 distinctive, objective crime scene criteria and subjected to an agglomerative hierarchical cluster analysis. Background psychiatric and general characteristics, Personality Assessment Inventory (PAI) scale scores, and criminal histories were described for each cluster. The cluster analysis drew attention to six clusters or behavioural profiles within the sexual assaults. Cluster 1 included serial offenders who aggressively raped and robbed adult women, with some pseudo‐intimate sexual behaviour, in their homes. Two thirds of these offenders had histories of sexual assault. Cluster 2 included offenders who again targeted adults in their homes, but without pseudo‐intimate sexual behaviour. Cluster 3 included offenders who targeted adults outdoors at night. These offenders showed high antisocial personality PAI scores and psychiatric histories of sexual sadism. Cluster 4 included unarmed offenders who targeted adults in their homes without robbery. These offenders often had psychiatric histories of depression. Cluster 5 included offenders who targeted adults outdoors with a blitz‐style attack, and Cluster 6 included offenders who targeted minors outdoors, without weapons, using a confidence‐trick style of approach. Paedophilia and histories of psychiatric treatment were prominent amongst these offenders. The results indicate therefore some of the key empirical relationships that future research may develop as the basis for sexual assault ‘profiles’. Copyright © 2014 John Wiley & Sons, Ltd.     

An emerging research agenda for investigative interviewing: hypotheses from the narrative action system

The present issue of JIP-OP brings together an intriguing range of papers that cover a wide range of aspects of testimony and aspects of investigative interviewing. They show how the considerations of how testimony is obtained is broadening out from the memory improvement strategies that once dominated this area with attempts to detect deception, to cover many aspects of how testimony is obtained. This draws attention to the need for more careful examination of the variations in testimony eliciting processes that will be responsive to differences in context and crime. A research agenda is therefore proposed that draws on developments in the understanding of psychological differences between crimes. This research would study the relationship between the psychological processes underpinning offence actions and the interview behaviour of suspects or witnesses. With regard to suspects, recent developments in the modelling of offence style have indicated a narrative basis (narrative action system model) for understanding the patterns of offence actions and the perpetrator's psychological background and characteristics that can be inferred from these. It is therefore suggested that the Hero's Quest, Professional's Adventure, Revenger's Tragedy, and Victim's Irony offending narratives and the Object, Vehicle, and Person victim roles assigned within these, may provide a fruitful link to different patterns of interview behaviour, with consequent implications for approaches to interviewing. Copyright © 2009 John Wiley & Sons, Ltd.     

Serial homicide: an investigation of behavioural consistency

To examine if serial homicide offenders are consistent across their crimes, a model was developed empirically that could be used to distinguish between crimes that were instrumental and those that were expressive. The first known three offences in each series of 69 US serial homicides committed by 23 offenders, were examined and the instrumental and expressive themes determined. Three models were then explored that test for consistency across these themes. The most liberal model was found to classify all of the offences effectively and to reveal complete consistency across the three crimes for all offenders. The implications of these results for offender profiling and further study of serial homicide are discussed. Copyright © 2005 John Wiley & Sons, Ltd.     

The Role of Attachment Styles and Interpersonal Problems in Suicide‐Related Behaviors

The relationships among adult attachment styles, interpersonal problems, and categories of suicide‐related behaviors (i.e., self‐harm, suicide attempts, and their co‐occurrence) were examined in a predominantly psychiatric sample (N = 406). Both anxious and avoidant attachment styles were associated with interpersonal problems. In turn, specific interpersonal problems differentially mediated the relations between attachment style and type of suicide‐related behaviors. These findings suggest the importance of distinguishing between these groups of behaviors in terms of etiological pathways, maintenance processes, and treatment interventions.