A Comparison of Intimate Partner Homicide With Intimate Partner Homicide-Suicide: Evidence From a Norwegian National 22-Year Cohort

Leaking in Intimate Partner Homicide: A Systematic Review

Intimate partner homicides (IPH) are serious offenses by a heterogeneous group of offenders with diverse risk factors that are too unspecific for the successful prediction of an offense. Recent research suggested several warning signs that may precede IPH and enhance its prevention, but little is still known about "leaking." Leaking comprises all offense-related statements, behaviors, or actions that express the perpetrator's thoughts, fantasies, ideas, interests, feelings, intentions, plans, or positive evaluations of an own violent act or previous similar offenses prior to the own attack. This review aims to identify the forms, recipients, and media of leaking as well as potential subgroup differences in cases of IPH. We identified 47 relevant publications via a systematic search of eight databases and additional methods. We included publications that did not explicitly use the term, but described behaviors that could be interpreted as leaking. Up to now, leaking has not been systematically researched in cases of IPH. Nevertheless, publications described several behaviors that are in line with our definition of leaking and were categorized into five broader categories: (a) homicide announcements, (b) previous severe acts of violence, (c) suicidal behavior, (d) planning activities, and (e) interest in similar offenses/offenders. Information on recipients and media as well as subgroup differences was sparse. Leaking is relevant in IPH, but more systematic research is needed to understand its potential role in future risk analyses procedures and prevention of IPH.

Deaths Related to Domestic Violence in Washington State

Importance

Domestic violence (DV; including intimate partner and family violence) is associated with heightened lethality risks, yet limited research has comprehensively assessed the connection between DV and fatal violence considering both homicides and suicides. Understanding the fatal consequences of DV can point to missed opportunities to support individuals and their families.

Objective

To assess the proportion of violent deaths that were connected to DV and describe contacts with the legal system or social services prior to each DV-related fatality.

Design, Setting, and Participants

This cross-sectional study used quantitative and qualitative data from the National Violent Death Reporting System (NVDRS) for all individuals who died by homicide or suicide in Washington from January 1, 2015, to December 31, 2020. Analyses were conducted from August 1, 2022, to September 30, 2023.

Main Outcomes and Measures

A multipronged approach was used to assess DV history using existing NVDRS variables, leveraging data from prior review of NVDRS death narratives, applying a validated natural language processing tool, and linking related deaths. Domestic violence was recorded as yes or no, but the decedent's role in the abusive relationship (ie, experiencing or enacting DV) could not be differentiated. To describe system involvement prior to each death, keyword searching and hand review of NVDRS death narratives were used.

Results

A total of 7352 intentional violent deaths (1192 homicides [16.2%]; 6160 suicides [83.8%]) with known circumstances were recorded in Washington during the study period. Of these, 948 deaths (12.9%) were connected to DV (624 [65.8%] among males; mean [SD] age at death, 45.3 [19.2] years), including 588 suicides (62.0%) and 360 homicides (38.0%). For 420 DV-related deaths (44.3%), there was evidence to suggest that the person who died or their intimate partner(s), family, or cohabitants had prior contacts with the legal system or social services. Specifically, 318 records (33.5%) mentioned prior contacts with law enforcement or the criminal legal system (eg, prior 9-1-1 calls, criminal convictions), and 225 (23.7%) described engagement with social services or the civil legal system (eg, civil protection order, divorce, or child custody problems).

Conclusions and Relevance

In this cross-sectional study, 12.9% of violent deaths in Washington were connected to DV. The findings suggest that more resources are needed to support law enforcement, court professionals, and social services specialists to proactively identify and refer families to wraparound supports before the situation can escalate to a fatality.

Changes in Rates of Suicide by Mass Shooters, 1980-2019

OBJECTIVE

The rate of worldwide mass shootings increased almost 400% over the last 40 years. About 30% are followed by the perpetrator's fatal or nonfatal suicide attempt.

METHOD

We examined the rate of fatal and nonfatal attempts among 528 mass shooters over the last 40 years and their relationship to detected mental illness to better understand this specific context of suicide. We collected information on U.S.-based, personal-cause mass murders that involved one or more firearms, from online sources.

RESULTS

A greater proportion of mass shooters from 2000 to 2019 took or attempted to take their own lives (40.5%) compared with those from 1980 to 1999 (23.2%, p < 0.001). More than double the proportion of perpetrators who made a fatal or nonfatal suicide attempt had a history of non-psychotic psychiatric/neurologic symptoms (38.9%), compared with perpetrators who did not make a fatal or nonfatal suicide attempt (18.1%; p < 0.001). Among mass shooters who made fatal or nonfatal suicide attempts, 77 of 175 (44%) did not have any recorded psychiatric, neurologic, or substance use condition. Of the 98 mass shooters who made fatal or non-fatal suicide attempts and had a psychiatric, substance use, or neurologic condition, 41 had depressive disorders.

CONCLUSION

It is possible that a lack of information about the perpetrators' mental health or suicidal ideation led to an underestimation of their prevalence. These data suggest that suicide associated with mass shootings may represent a specific context for suicide, and approaches such as psychological autopsy can help to ascertain when psychiatric illness mediates the relationship between mass shootings and suicide.

A special type of homicide-suicide: A retrospective study of the characteristics of extended suicide

Extended suicide, a specific type of homicide-suicide event, has severe social consequences yet remains lacking systematic research. This retrospective study investigated 51 cases of extended suicide involving mental disorders in central China with aim of better understanding risk factors for such events and guiding prevention strategies. Over an 8-year period from 2015 to 2022, cases were collected from forensic institutions, and demographic characteristics, case details, and psychiatric data were recorded. The 51 incidents involved 51 perpetrators and 79 victims, with more female perpetrators (58.8%) and more female victims (54.4%). The average age of the perpetrators was 36.1, and most were married (88.2%). Almost all of the victims were family members of the perpetrator, like the most numerous children (64.6%), followed by spouses (24.1%). The most common homicide mode of death was mechanical asphyxia (38.0%), followed by sharp devices (36.7%) and drug poisoning (16.5%). Depressive disorders (76.5%) were the most common diagnosis of mental disorder for perpetrators. The study analyzed the unique characteristics of extended suicide to enrich such data. These findings help strengthen the screening and identification of potential perpetrators and victims to prevent such cases from occurring.

Intimate Partner Homicide: Comparison Between Homicide and Homicide-Suicide in Portugal

Intimate partner homicide (IPH) is a tragic event. Studies involving the comparison between IPH and intimate partner homicide-suicide (IPH-S) are scarce, with few studies in Portugal about this issue. The current study aims to compare IPH and IPH-S perpetrators, the victim-perpetrator relationships dynamics, and homicide circumstances. The data was collected through the analysis of 78 judicial processes of IPH that occurred in Portugal, between 2010 and 2015. Of the cases, 51 were IPH, 20 were IPH-S cases, and seven were attempted suicide cases, being perpetrated in 84.6% (n = 66) for male perpetrators. Suicide after intimate homicide were all committed by men. All judicial processes analyzed refer to heterosexual relationships. Bivariate and multivariate analyses were performed to compare the groups concerning perpetrator and victim sociodemographic characteristics, victim-perpetrator dyadic dynamics, and crime circumstances. The results show mostly common trends between the two groups with some differentiating factors when compared individually (e.g., perpetrator professional status, criminal records). Regression logistic analysis showed no differences between IPH and IPH-S.

A classification of combined homicide-suicide: An update-Part II: Intrafamilial homicide-suicide

This Part II of the three-part presentation of the updated classification of combined-homicide published in the Journal of Forensic Sciences addresses intrafamilial homicide-suicides (H-Ss). Intrafamilial H-Ss in this classification includes all close relationships including dating and intimate partners, not just traditional family relationships, in contrast to extrafamilial H-Ss where the victim(s) of homicide are either strangers or in a more formal but nonintimate relationship with the actor. Intrafamilial H-Ss are further divided and classified as intimate partner, filicide, familicide, parricide, and siblicide H-Ss, respectively, and are typically so grouped in the literature.

Intimate Partner Homicides in Norway 1990-2020: An Analysis of Incidence and Characteristics

Intimate partner homicide (IPH) is an extreme outcome of intimate partner violence (IPV). It is a societal challenge that needs to be investigated over time to see whether changes occur concerning the incidence of IPH, IPH characteristics, socioeconomic factors, and contact with service providers. This study includes the total Norwegian cohort of IPHs between 1990 and 2019 with a final conviction (N = 224). Poisson regression was applied to model the incidence rate of homicide and IPH between 1990 and 2020 as well as the incidence rates of immigrant perpetrators and victims. Multivariate logistic regression analyses were used to test the association between characteristics and period 1990-2012 compared to after 2012 as dependent variable. The results show that though homicide incidence rates in Norway declined steadily and significantly after 1990, IPH rates did not begin to decline until 2015. The following IPH characteristics showed reduced incidence after 2012: IPH-suicide, perpetrators with a criminal record, and IPHs perpetrated subsequent to preventive interventions towards the perpetrator. Sentence length in IPH cases had increased. Changes were not observed for any of the other IPH characteristics investigated. IPH is often the culmination of long-term violence and can be prevented, even if risk assessment is challenging due to the low base rates.

Risk Factors for Intimate Partner Femicide-Suicide in Italy: An Ecological Approach

The present study investigated the intimate partner femicide (IPF) and intimate partner femicide-suicide (IPFS) perpetrators' individual, relational, and contextual characteristics by analyzing, within the ecological approach, femicide cases that occurred in Italy from 2010 to 2019. On the topic, to date, scant studies examined possible differences between IPF and IPFS risk factors, and no studies have analyzed these factors by adopting an ecological systems model perspective. To this aim, archival research was carried out. Of a total of 1.207 femicides, 409 were IPF, and 227 were IPFS. Perpetrators' age, level of employment, law enforcement membership, mental and/or physical illnesses, use of psychoactive substances, previous crimes, previous violent relationships, presence of children, previous violence in the couple, inability to accept the end of the relationship, quarrels and conflict, jealousy and the psychophysical illnesses of both authors and victims, as well as the use of firearms and victim's request for help were analyzed. The results underlined the existence of different risk factors contributing to the IPF perpetrators' decision to commit suicide such as perpetrators' age, law enforcement membership, and firearm availability. These findings stress the need for specific risk assessment and management strategies for IPFS perpetrators.

The Perpetrator-Victim Relationship: An Important Clue in Understanding Intimate Partner Homicide in China

Intimate partner homicide (IPH) is a global public health issue that has serious consequences for an individual's health. Whereas prior research has made some progress analyzing the perpetrator-victim relationship in understanding the dynamics of IPH, research set in the context of China in this field using the perpetrator-victim relationship as a focal variable in analyzing IPH is still lacking. The current study addresses this gap and builds on existing research by exploring the significance of the perpetrator-victim relationship in order to facilitate a deeper understanding of IPH in China. After examining 979 IPH criminal judgments, the findings revealed that the perpetrator-victim relationship is an important clue in understanding IPH in China today. By analyzing the correlation between intimate relationships as a focal variable and other variables such as IPH characteristics and risk factors, it is possible to understand the prevalence of IPH in China in greater detail. Irrespective of the kind of relationship between the perpetrator and victim, the findings revealed that most of them come from lower socioeconomic backgrounds, have no previous history of intimate partner violence, and are not satisfied with their marriages. Although research has provided detailed explanations, the perpetrator-victim relationship remains neglected, especially in the context of research on contemporary China. The findings showed that over half of the perpetrators and victims had intimate relationships with people outside their marriages. This may be the main reason for the rapid increase in the number of instances of IPH, which seems to be in tandem with China's rapid modernization and urbanization.

Is Homicide Followed by Suicide a Phenomenon in Itself? A Comparison of Homicide and Homicide-Suicide in Spain

The phenomenon of homicide followed by suicide (HS) has a low prevalence worldwide, although the literature has identified that these cases represent a significant percentage in homicide subtypes such as intimate partner homicide or filicide. In the present study, HS (n = 41) and homicides in which the perpetrator did not commit suicide after the event (n = 556) are compared. The information was extracted from police reports of homicides committed in Spain between 2010 and 2012 and belonging to the jurisdictions of the National Police and Civil Guard. The results showed that out of the total number of homicides analyzed, HS accounted for 4.9%, which implies a rate of 0.05 per 100,000 inhabitants. The findings of the study show that the profile of a HS victim of a 52-year-old Spanish woman. The perpetrator is of Spanish origin, 50 years old, unemployed, or retired, with a mental disorder, and with substance use being uncommon at the time of the event. HS events take place at the perpetrator's home, are related to interpersonal conflicts, involve a single perpetrator, several victims, and are mainly committed with a firearm. The findings are mostly consistent with previous studies and the prevalence of HS in the couple setting is highlighted (56.5%). However, the importance of studying cases outside of this setting is emphasized since it has been found that 30.5% of cases involve other family relationships and 13% occurred outside the domestic sphere.

Archival data review of intimate partner homicide-suicide in Jamaica, 2007 - 2017: focus on mental health and community response

Objective.

To identify social and behavioral patterns and mental health concerns associated with intimate partner homicide-suicide (IPHS) in Jamaica through an analysis of media and police reports.

Methods.

This was an archival data review of police records and print, radio, and television reports of IPHS incidents from January 2007 – June 2017 in Jamaica. The 27 cases found were qualitatively analyzed using pre-identified codes and open coding to generate themes and patterns.

Results.

A prevalence rate of 0.1 per 100 000 was determined. In all cases, males were the homicide-offender. Sociodemographic patterns associated with IPHS incidents—age, personality traits, choice of weapon, and time of occurrence—were consistent with previous findings. Common triggers were offender obsession, sexual jealousy, and fear of separation. Despite reports of mental health concerns in both male and female partners, neither the couples nor community members sought help prior to the homicide-suicide.

Conclusion.

These findings demand a change in cultural attitudes toward domestic disputes and mental health concerns, and a redefining of the community’s responsibility in IPHS. The warning signs associated with IPHS should be part of existing violence and suicide prevention programs.