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Due to the rarity of mass murder, scholars have focused almost exclusively on its individual-level risk factors, assuming that structural characteristics play a negligible role in the etiology of this infrequent but impactful crime. This study explores whether local structural factors influence the incidence rate of mass murder and its logical comparison group, homicide. Using information from a novel mass killing database as well as the Supplementary Homicide Reports (SHR), two-level count regression models examine the county- and state-level factors that predict the number of mass murder ( N = 549) and homicide incidents ( N = 274,399) in 3,143 U.S. counties from 2000 to 2018. Results indicate that mass murder is more likely to occur in disadvantaged and racially/ethnically heterogeneous areas, similar to homicide in general. Future research should examine both perpetrators and their environments instead of assuming that mass murders are exclusively driven by individual-level factors.

Mass public shootings in the United States have increased in number and severity in recent years, and there has been a corresponding rise in media reporting of such incidents. Does media coverage of these events lead to a short-term increase in the probability of additional shootings? James Alan Fox, Nathan E. Sanders, Emma E. Fridel, Grant Duwe and Michael Rocque investigate

Following Kleck’s critique on my recent article on guns, firearms homicide, and mass shootings, I wrote a detailed and thorough reply refuting his methodological concerns and discussing directions ...

Police use of deadly force represents a pressing public policy issue with implications for police-community relationships and equitable access to justice. A growing body of literature considering t...

Although mass murder is traditionally examined as a separate construct from homicide generally, few studies have explored their similarities and differences. This study compares the incident, victim, and offender characteristics of: (1) mass murderers and homicide offenders; and (2) mass murder-suicide offenders and homicide-suicide perpetrators. Mass murderers are more likely to be male; commit suicide; kill young, white, and female victims; use firearms; co-offend; operate in public places; and kill as part of drug trafficking and/or gang warfare. The analysis demonstrates that mass murderers are distinct from both homicide and homicide-suicide perpetrators, and represent a unique type of violent offender.

Although mass shootings have fueled calls for large-scale changes in gun ownership and concealed carry legislation over the past thirty years, few studies have evaluated whether permissive gun poli...

Despite a wealth of research on intimate partner homicide, research on intimate partner homicide followed by suicide of the perpetrator is sparse. Existing studies on intimate partner homicide-suicide: tend to be descriptive, not keeping pace with quantitative advances in the epidemiological and social sciences; have yet to examine how context impacts intimate partner homicide-suicide; and are typically limited to male perpetrators, given small localized samples of female-perpetrated intimate partner (homicide and) homicide-suicide. This study uses data on 7584 heterosexual intimate partner homicide and homicide-suicide cases distributed across 2465 places and 42 U.S. states from the National Violent Death Reporting System (2003–2018) to examine the victim and perpetrator characteristics, relationship dynamics, situational factors, and contextual features that influence the likelihood of committing suicide following intimate partner homicide. Hierarchical logistic regression models indicate that victim characteristics that increase the vulnerability to victimization (alcohol and drug use, mental health problems, less than some college education) decrease the odds of committing suicide following intimate partner homicide. Similarly, situational (victim weapon usage, additional perpetrators) and contextual (concentrated disadvantage, residential instability) risk factors decrease the odds of committing suicide following intimate partner homicide. Conversely, impairment of the perpetrator (alcohol use, mental health problems) and a more intimate victim-perpetrator relationship (spousal relationship, caregiver) increases the odds of homicide-suicide. Additionally, results indicate that firearms play an integral part in homicide-suicide as well as in decreasing the gender gap in homicide-suicide. The findings suggest that the internalization of guilt by perpetrators of intimate partner homicide may play a key role in subsequent suicide. Practically, limiting firearm exposure will not only reduce the lethality of intimate partner violence, but will decrease the odds of perpetrator suicide following intimate partner homicide. This is particularly true for female-perpetrated homicide-suicide, which is unlikely to occur without a firearm.

Use of lethal force by police officers has incited riots, inspired social movements, and engendered socio-political debate. Police officers also assume a high level of risk during police–citizen encounters. Yet, existing studies tend to center on these two phenomena independently. Additionally, the under-utilization of multilevel research in these areas of inquiry has hampered attempts to empirically disentangle the individual, agency, and contextual correlates of fatal police–citizen encounters. This study integrates the predominantly distinct research bases on these phenomena to examine the contexts in which police use lethal force, relative to the contexts in which officers are killed in the line of duty. Data were compiled on 6416 citizen fatalities and 709 officer fatalities distributed across 1735 agencies and 1506 U.S. places from 2000 to 2016. A series of three-level logistic regression models examined the civilian and officer characteristics, organizational factors, and contextual features that impacted the odds of citizen fatalities by the police relative to police lethal victimization. Findings indicated that structural disadvantage increased the odds of police lethal victimization relative to citizen fatalities by the police. Moreover, this contextual effect was, in part, a product of increased firearm usage by citizens who killed police in more disadvantaged areas. A more complete understanding of fatal police–citizen encounters requires considering police use of lethal force and police lethal victimization concurrently in their broader social contexts.

There is virtually no information on the relevance of contextual gun availability for homicide-suicide, or on whether ecological gun availability distinguishes homicide-suicide from homicide-only and suicide-only. This study addresses these gaps in the literature. Data from the National Violent Death Reporting System includes 2,535 homicide-suicides, 28,027 homicides, and 138,948 suicides across 1,584 counties and 50 U.S. states from 2003 to 2015. Results indicated that ecological gun ownership increased state rates of homicide-suicide and amplified the odds of firearm violence against two persons (other and self) relative to one (other or self). The results suggest that limiting gun availability can significantly reduce homicide-suicide.

Research has shown that female offenders typically receive differential treatment in the criminal justice system in comparison to their male counterparts, even for extreme crimes like murder. This study compares the criminal sentences of 300 homicide offenders who killed at least two victims with a single co-offender (150 pairs) within their dyads using the actor–partner interdependence model (APIM) to determine if gender has an effect on leniency for even the most extreme crimes. Women were less likely to receive the harshest possible punishment, regardless of their partner’s gender. These findings provide support for the female leniency effect, suggesting that gender bias continues to influence sentencing decisions for homicide.

In the research literature on homicide, gender has typically received far less attention than other demographic characteristics, specifically the age and race of victims and offenders. To ...

Objectives: Bridge the gap between feminist scholarship and sociological literature on gun utility by examining the correlates of gun usage in heterosexual intimate partner homicide by offender gender. Methods: Using data on 7,588 incidents from the National Violent Death Reporting System (NVDRS) from 2003 to 2018, logistic regression models examined the odds of using a firearm during intimate partner homicide for both male and female offenders. Results: Men disproportionately employed guns to regain control when their dominance and/or masculinity was threatened, whereas women used firearms in self-defense against an armed partner. Conclusions: The results suggest that gender-based motivations distinguish whether or not a firearm is used in intimate partner homicide.

Mass public shootings have generated significant levels of fear in the recent years, with many observers criticizing the media for fostering a moral panic, if not an actual rise in the frequency of such attacks. Scholarly research suggests that the media can potentially impact the prevalence of mass shootings in two respects: (i) some individuals may be inspired to mimic the actions of highly publicized offenders; and (ii) a more general contagion process may manifest as a temporary increase in the likelihood of shootings associated with a triggering event. In this study of mass shootings since 2000, we focus on short-term contagion, rather than imitation that can traverse years. Specifically, after highlighting the sequencing of news coverage prior and subsequent to mass shootings, we apply multivariate point process models to disentangle the correlated incidence of mass public shootings and news coverage of such events. The findings suggest that mass public shootings have a strong effect on the level of news reporting, but that news reporting on the topic has little impact, at least in the relative short-term, on the subsequent prevalence of mass shootings. Finally, the results appear to rule out the presence of strong self-excitation of mass shootings, placing clear limits on generalized short-term contagion effects. Supplementary files for this article are available online.

Objective In this study, we analyzed the relationship between state firearm laws and the incidence and severity (i.e., number of victims) of mass public shootings in the United States during the period 1976-2018. Hypotheses We hypothesized that states requiring permits to purchase firearms would have a lower incidence of mass public shootings than states not requiring permits. We also hypothesized that states banning large-capacity ammunition magazines would experience a lower number of victims in mass public shootings that did occur than states without bans. Method We developed a panel of annual, state-specific data on firearm laws and mass public shooting events and victim counts. We used a generalized estimating equations logistic regression to examine the relationship between eight state firearm laws and the likelihood of a mass public shooting. We then used a zero-inflated negative binomial model to assess the relationship between these laws and the number of fatalities and nonfatal injuries in these incidents. Results State laws requiring a permit to purchase a firearm were associated with 60% lower odds of a mass public shooting occurring (95% confidence interval [CI: -32%, -76%]). Large-capacity magazine bans were associated with 38% fewer fatalities (95% CI [-12%, -57%]) and 77% fewer nonfatal injuries (95% CI [-43%, -91%]) when a mass shooting occurred. Conclusion Laws requiring permits to purchase a gun are associated with a lower incidence of mass public shootings, and bans on large capacity magazines are associated with fewer fatalities and nonfatal injuries when such events do occur. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

In Too Few Victims: Finding the Optimal Minimum Victim Threshold for Defining Serial Murder, we empirically examined how victim count influences the definition of serial homicide. With a series of multinomial logistic regressions, we determined that a cutoff of three victims was optimal to ensure a more homogeneous population, and recommended a return to this traditional threshold (Fridel & Fox, 2018). In response, Yaksic (2018) published a scathing review of our work, claiming that our study was “transgressing” against serial homicide research and actively hampering law enforcement investigations. In addition to defending our original study, we reject his suggestion to rely solely on the qualitative methods of the past and firmly advocate for the modernization of serial homicide research through rigorous quantitative analysis.

Literature has documented racial and ethnic disparities in resident fatalities by the police and police fatalities by residents. Yet, there has been a lack of research on police-resident relationships within Hispanic communities. Additionally, research has rarely considered the relevance of social context for fatal police-resident encounters or examined resident and police fatalities concurrently. We use data on 7,125 fatal police-resident encounters nested within 1,739 agencies and 1,506 U.S. census-designated places from 2000–2016 to examine whether macro-level racial and ethnic composition distinguishes resident fatalities and police fatalities. Results indicated that the odds of resident fatalities relative to police fatalities were significantly higher in majority Hispanic than majority white places. Racial disparities persisted in mixed-race places with at least 20% Hispanic residents. Furthermore, disparities were only observed in highly disadvantaged places, suggesting that racial and ethnic composition and structural disadvantage must be considered concomitantly to contextualize fatal police-resident encounters.

The mass murderer is known by a variety of names in both public and academic spheres, from the family annihilator to the active shooter, from the workplace avenger to the rampage school shooter. Although most researchers acknowledge that the phenomenon is heterogeneous, mass killing has defied classification, and currently no consensus typology exists. Most previous efforts at developing a classification scheme have focused on sorting these multicides into three broad groups, namely, family, felony, and public mass killings, exclusively relying on qualitative methods and case-study analysis to do so. The present study employs a multivariate approach to examine differences among types in victim, offender, and incident characteristics on the population of all mass murders in the United States from 2006 to 2016.