More than a decade before a San Jose, California, transit employee killed nine co-workers in 2021, an ex-girlfriend accused him in court of physical abuse and sexual assault. The case did not lead to a criminal conviction or a permanent restraining order, which would have barred him from buying guns.
The woman told a local news station that the man had always been mentally unstable and prone to bouts of rage. But with this deadly public rampage, his abuse crossed a line into the public realm. “He’s a murderer,” she said. “He killed innocent people.”
Perpetrators of some of the country’s deadliest shootings have had domestic violence allegations, arrests, or charges in their backgrounds. The man who killed 49 people at Pulse nightclub in Orlando in 2016 was abusive toward his ex-wife, who described frequent beatings. Five years before an Air Force veteran killed 26 people at a church in Sutherland Springs, Texas, in 2017, he was court-martialed for attacking his then-wife and her infant daughter. The teenage perpetrator of the 2018 shooting at Marjory Stoneman Douglas High School in Parkland, Florida, was reportedly abusive toward his ex.
Research has further solidified the connection between domestic violence and a propensity for public acts of violence. A team at the Johns Hopkins Center for Gun Violence Solutions analyzed 110 gun murders of four or more people between 2014 and 2019 and found that in 68 percent of incidents, the perpetrator either killed an intimate partner or a family member, or had a history of domestic violence.
When that’s the case, more people tend to die. The study also found that mass shootings in which gunmen target an intimate partner or family member have a fatality rate that’s just over 20 percentage points higher than that of other mass shootings. That could be because the perpetrators target specific victims with a clear intent, the researchers said, unlike those firing indiscriminately in a public place.
Understanding how rage can boil over into violence — and removing guns from people most likely to use them in acts of violence — should be a public policy imperative, said Lisa Geller, the study’s main author. “We know that past violence is the best predictor of future violence,” she said, “and often that past violence is domestic violence.”
The Gun Violence Archive reports that 259 mass shootings (defined as four or more people injured or killed) since 2013 have been domestic in nature. All of them demonstrate that gun violence is often a lot more intimate than the way mass shootings are portrayed in the media: as random, public attacks perpetrated by strangers. In reality, Americans are still most likely to be shot by someone they know.
Here, we break down the ways domestic and mass shootings intersect — and what can be done to break the connection:
Some perpetrators of active shootings have a history of domestic violence
This history can show up in police reports, arrests, dropped charges, convictions, or restraining orders. April Zeoli, an associate professor of health management and policy at the University of Michigan School of Public Health who researches intimate partner homicide, said both intimate partner abuse and mass public violence share the same root cause. “Domestic violence is about power and control over your intimate partner,” she told The Trace. “And a mass shooting is about control over whether people live or die, so it is that ultimate power.”
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After the Pulse shooting, Gene Deisinger, a psychologist who handles threat assessment for Virginia Tech’s campus police department, told The Trace that he keeps an eye out for people who have committed acts of domestic violence or other expressions of “acute anger.”
“Once you’ve crossed the threshold of being angry and violent, it’s easier to cross again in the future,” Deisinger said.
That was the case in 2020, when a man with a prior charge for misdemeanor battery against a woman killed fatally shot five of his co-workers at the Molson Coors brewery in Milwaukee before taking his own life. Years before an Illinois man killed six co-workers at a warehouse in Aurora in 2019, an ex-girlfriend filed two restraining orders against him. And the perpetrator of the June 2017 Congressional baseball shooting, which left four people wounded, including Representative Steve Scalise of Louisiana, had been arrested 11 years earlier for hitting and choking his daughter and shooting at her friend’s boyfriend.
Public mass shootings are sometimes preceded by a domestic shooting
Scores of domestic shootings have progressed to public gun rampages, moving from intimate targets to unknown ones in a matter of hours. In 2019, a California man went on a 12-hour shooting spree across the San Fernando Valley, first killing his father and his brother and wounding his mother at their home in Canoga Park, then traveling to North Hollywood and gunning down an acquaintance and a passenger on a bus. The night before a California man embarked on a 2017 shooting spree through the rural community of Rancho Tehama Reserve that left four people dead and 11 others wounded, he fatally shot his wife and hid her body under the floor of their trailer.
Even the first modern mass shooting began with domestic homicide: The perpetrator of the 1966 shooting at the University of Texas at Austin killed his wife and mother the night before his rampage.
Zeoli said it’s been difficult to explore the psychology of mass shooters who also kill family members because so many of them kill themselves as well. But she suspects that suicide is a driving factor. “We know that suicidality of a violent partner is one of the predictors of intimate partner homicide,” she said. “So it could be that whatever the impetus for suicide is, that’s driving this larger public mass shooting as well.”
Some domestic shootings are carried out in public and leave bystanders dead, too
In recent years, several shooters targeting intimate partners in public places also killed their victim’s family members or co-workers, or strangers who happened to be nearby.
In September 2020, a man killed his wife and two children then gunned down two neighbors in his McGregor, Texas, neighborhood. In November 2018, a man gunned down his ex-fiancée, emergency room doctor Tamara O’Neal, outside the Chicago hospital where she worked following an argument over their broken engagement. He then ran inside the hospital and fatally shot a 25-year-old pharmacy resident and a responding police officer.
Zeoli said that while “the vast majority” of domestic violence perpetrators never become mass shooters, it’s easy to imagine how abusers can perpetrate violence outside the home. “People who commit domestic violence have demonstrated that they are more than willing to terrorize and harm the people they purport to love,” she said. “It may be that whatever psychology underlies their desire to harm, like seriously harm and inflict damage on the people they love, is the same psychology that lends itself to mass shootings.”
Then there are domestic mass shootings, which target family members and take place at home
According to one estimate, the majority of mass gun murders in the U.S. take place in private, and they’re usually domestic. So-called family annihilators kill their entire immediate families and often themselves, usually with guns. Many of these stories go unreported by most national media outlets, obscuring both their frequency and the risk to the general public. For example, domestic shootings of children are far more frequent than school shootings of children.
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In Henryetta, Oklahoma, in April 2023, a convicted rapist facing a return to prison fatally shot his wife, her three children, and two of the children’s friends who were spending the weekend with the family. In Enoch, Utah, in January 2023, a man killed his wife and their five children two weeks after she filed for divorce. He also killed her mother. In 2021, a man in Muskogee, Oklahoma, was charged with killing his brother and five relatives under age 10, three of whom were his children.
“We think about mass shootings in public places, and people are scared to go to the grocery store, they’re scared to go to concerts,” said Geller, the author of the Injury Epidemiology study. “But there are so many people who are scared to be in their own homes, and that often gets overlooked.”
Mass domestic killings that transpire at home can also kill people who are not related to the gunman or victim. In 2021, a man in Colorado Springs opened fire on his girlfriend after being excluded from a birthday party, killing her and five of her family members.
What can be done to keep firearms from domestic abusers?
The presence of guns can turn domestic disputes deadly. Abused women are five times more likely to die if their abuser has access to a gun. If their partner threatened them with a gun, the risk of death is 20 times higher.
But keeping firearms away from abusers is a challenge, made harder by loopholes that allow people to arrange gun sales online, at gun shows, and from private sellers without a background check. In October 2012, a Wisconsin man walked into the spa where his ex-wife worked and shot seven people, killing her and three others, using a handgun he purchased via the online broker Armslist. He’d turned to the site after being served with a restraining order three days earlier.
Geller recommends the nationwide adoption of extreme risk protection orders, or red flag laws, which allow police or family members to petition a judge to disarm potentially dangerous people. As of June 2023, 21 states and Washington, D.C., have enacted red flag laws, most of them since the 2018 Parkland shooting. ERPOs are civil protection orders, which means they’re not accompanied by criminal charges. “The goal is to prevent acts before they occur,” Geller said. “There are certain periods of time where some individuals should not have a gun. These are not permanent bans on firearm ownership.” In 2019, a team from UC Davis School of Medicine analyzed court records from 159 extreme risk protection order cases in California between 2016 and 2018 and identified 21 cases in which one was used to try to prevent a mass shooting.
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There are also state-level gun bans for domestic abusers. A 1996 federal law called the Lautenberg Amendment bans gun possession for people convicted of misdemeanor domestic violence and those who have been served with permanent orders of protection. But it has significant loopholes: It was only recently extended to abusive dating partners in 2022, and first-time offenders could have their gun rights reinstated after five years. The vast majority of domestic violence occurs among dating partners. Also, it doesn’t apply to people convicted of misdemeanor stalking, only the more serious charge of felony stalking.
And the Lautenberg Amendment can be difficult to enforce, especially when it comes to abusers who own guns before they are convicted. The federal government doesn’t require abusers to relinquish their weapon; it relies on the honor system (though federal prosecutors in a handful of states are cracking down on domestic abusers who unlawfully keep guns).
Thirty-three states and D.C. have crafted matching laws that empower local authorities to enforce Lautenberg. States that go beyond federal law and require abusers to relinquish their weapons to police have lower rates of intimate partner homicide, a 2017 study found. And 30 states and D.C. prohibit some abusive dating partners from gaining access to firearms, effectively closing the boyfriend loophole.
Without federal uniformity, cases slip through the cracks, and lives can be lost. In 2021, we reported on Rosemarie Reilly, a Michigan woman killed by her ex-boyfriend in 2016. Three weeks before she was murdered, Reilly had gotten a protective order against him, but a judge denied the gun restriction.