Niels Habermann

Criminal Recidivism in Sexual Homicide Perpetrators

Forensic psychiatric reports on 166 sexual homicide perpetrators in Germany were retrospectively analyzed for criminal risk factors. Follow-up information about release and reconvictions from federal criminal records was available for 139 offenders; 90 (64.7%) had been released. The estimated recidivism rate (Kaplan—Meier analyses) for 20 years at risk was 23.1% for sexual and 18.3% for nonsexual violent reoffences. Three men (3.3%) were reconvicted for attempted or completed homicide. Only young age at the time of sexual homicide resulted in higher sexual recidivism, whereas increased nonsexual violent recidivism was related to previous sexual and nonsexual delinquency, psychopathic symptoms, and higher scores in risk assessment instruments. Increased recidivism with any violent reoffence was associated with age-related factors: young age at first sexual offence, at homicide, and at release and duration of detention. The impacts of the results for risk assessment, relapse prevention, and supervision are discussed.

Psychiatric Disorders in Single and Multiple Sexual Murderers

Background: Sexual homicides – and particularly offenders with multiple victims – receive much attention in the general public as well as among forensic experts. The aim of this study was to assess psychiatric disorders in a large sample of sexual murderers and to identify disorders related to multiple sexual homicides. Sampling and Methods: Psychiatric court reports from 20 German forensic psychiatrists on 166 men who had committed a sexual homicide were evaluated for psychiatric disorders according to DSM-IV, including standardized instruments for personality disorders (criteria from the Structured Clinical Interview) and psychopathy (Psychopathy Checklist-Revised). Offenders with a single sexual homicide victim (n = 130) were compared to those with multiple victims (n = 36). Results: High lifetime prevalence rates were found for substance abuse or dependence, paraphilias (especially sexual sadism), sexual dysfunctions and personality disorders (especially antisocial, borderline, sadistic and schizoid). In the multiple sexual murderer group sexual sadism, voyeurism, sadistic, antisocial and schizoid personality disorders were more frequent than in the single-victim group; none of the multiple offenders was diagnosed with a mood disorder. Conclusions and Limitations: Multiple sexual murderers are characterized by disorders in three major psychopathological domains: sexual as well as ‘character’ sadism, antisociality and schizoid personality. A thorough diagnostic evaluation of Axis I as well as Axis II disorders should be part of risk assessments in sexual homicide perpetrators. Although the study was a retrospective investigation on psychiatric court reports, the size of the sample and consistency with results from previous studies give confidence that the identified group differences are unlikely to be due to methodological limitations.

The influence of brain abnormalities on psychosocial development, criminal history and paraphilias in sexual murderers.

The aim of this study was to investigate the number and type of brain abnormalities and their influence on psychosocial development, criminal history and paraphilias in sexual murderers. We analyzed psychiatric court reports of 166 sexual murderers and compared a group with notable signs of brain abnormalities (N = 50) with those without any signs (N = 116). Sexual murderers with brain abnormalities suffered more from early behavior problems. They were less likely to cohabitate with the victim at the time of the homicide and had more victims at the age of six years or younger. Psychiatric diagnoses revealed a higher total number of paraphilias: Transvestic fetishism and paraphilias not otherwise specified were more frequent in offenders with brain abnormalities. A binary logistic regression identified five predictors that accounted for 46.8% of the variance explaining the presence of brain abnormalities. Our results suggest the importance of a comprehensive neurological and psychological examination of this special offender group.

XYY chromosome abnormality in sexual homicide perpetrators

In a retrospective investigation of the court reports about sexual homicide perpetrators chromosome analysis had been carried out in 13 of 166 (7.8%) men. Three men (1.8%) with XYY chromosome abnormality were found. This rate is much higher than that found in unselected samples of prisoners (0.7–0.9%) or in the general population (0.01%). The three men had shown prepubescent abnormalities, school problems, and had suffered from physical abuse. The chromosome analysis in all cases had been carried out in connection with the forensic psychiatric court report due to the sexual homicide. However, two men had earlier psychiatric referrals. All were diagnosed as sexual sadistic, showed a psychopathic syndrome or psychopathy according to the Psychopathy Checklist‐Revised [Hare RD, 1991, The Hare Psychopathy Checklist‐Revised, Toronto, Ontario, Canada: Multi‐Health Systems]. Two were multiple murderers. Especially forensic psychiatrists should be vigilant of the possibility of XYY chromosome abnormalities in sexual offenders.

The Utility of Risk Assessment Instruments for the Prediction of Recidivism in Sexual Homicide Perpetrators

To examine the predictive accuracy of four well established risk assessment instruments (PCL-R, HCR-20, SVR-20, and Static-99) in an important subgroup of sexual offenders, these instruments were assessed retrospectively based on information from forensic psychiatric court reports in a sample of 90 released male sexual homicide offenders (out of an original sample of 166) in Germany. Follow-up information about criminal reconvictions after release were obtained from the federal criminal records. Total scores as well as subscales and single items of these risk assessment instruments did not predict sexual recidivism, and only some of them had moderate predictive power regarding nonsexual violent recidivism. Possible explanations for these unexpected results are the retrospective study design with missing information about influences during the long duration of detention and time after release, the small sample size as well as the possibility that the risk assessment instruments investigated were valid for general sex offender samples, but not for the particular subgroup of offenders with sexually motivated homicides.

Antiandrogenic Pharmacotherapy of Sexual Offenders and Home Leave Steps in the Forensic Psychiatric Hospital Berlin

OBJECTIVE Evaluation of the relationship between antiandrogenic therapy of sexual offenders and home leave steps in a forensic psychiatric hospital. METHODS Retrospective evaluation of all sexual offenders (n = 79) who were treated in the forensic psychiatric hospital Berlin between the 1.1.1998 and the 1.1.2005. RESULTS There is an increase in the number of patients treated with antiandrogenic medication during the observed time period. Patients under this kind of pharmacotherapy receive higher grades of home leave steps. CONCLUSIONS As possible reasons for the observed changes we discuss the contemporaneous implementation of a new pharmacotherapeutic treatment option (LHRH-agonists) and an aggravation of the German criminal law for sexual offenders.

Sexual Murderers With Adult or Child Victims: Are They Different?

This study investigates characteristics differentiating sexually motivated murderers targeting child victims (CV; n = 35) from those with only adult victims (AV; n = 100). In the initial phase, psychiatric court reports were evaluated using standardized instruments (SCID-II, PCL-R, HCR-20, SVR-20, Static-99). In the second phase, data on duration of detention and reconviction rates were obtained from German federal criminal records. The CV group showed more often diagnostic criteria of pedophilia (43% vs. 4%) and less often alcohol abuse and drug dependency (31% vs. 55%), sexual dysfunctions (9% vs. 29%) and narcissistic personality disorder (0% vs. 13%). No significant differences were found regarding PCL-R and total risk assessment scores. Child victim perpetrators were more likely to have committed acts of sexual child abuse before the sexual homicide (46% vs. 16%) but were less likely to have committed rape or sexual assault (17% vs. 42%) or caused bodily injury (26% vs. 50%). The CV group was detained more frequently in forensic psychiatric hospitals (59% vs. 26%), but the two groups showed the same rates of release and reconviction for sexual (22% for both groups), nonsexual violent (CV 25% vs. AV 15%) and nonviolent offenses (CV 63% vs. AV 59%). Although well-known differences between nonhomicidal sexual child abusers and rapists were replicated in this study on sexual homicide perpetrators, the groups showed more similarities than differences. The high prevalence of violence and antisocial personality disorder in both groups seem to be important risk factors for committing a (sexual) homicide and might have outweighed other differences.

Criminal responsibility in sexual homicide perpetrators

OBJECTIVE Evaluation of criteria for criminal responsibility, esp. in paraphilias and personality disorders. METHODS We compared sexual murderers with diminished responsibility or not-guilty for reasons of insanity (n = 73) and those held fully responsible (n = 61) regarding psychiatric disorders, signs of severe paraphilias, level of personality structure (using Operationalized Psychodynamic Diagnostics) and offence related criteria. RESULTS Sexual murderers found as diminished responsible or not-guilty, especially those detained in forensic psychiatric hospitals, showed more signs of a progressive sadistic development and lower levels of personality structure. Offence related criteria that are regarded as not supporting a diminished capacity plea (purposeful actions, long duration, complex, stepwise course of the offence) were found more frequent in those offenders that were detained in forensic hospitals. CONCLUSIONS Signs for severity of paraphilias and personality disorders are useful in decisions about criminal responsibility. Criteria regarding purposeful course of action appear not to be adequate for the assessment of paraphilic sexual offenders.