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In the wake of the massacre at a small-town Texas church on Sunday, many people are asking why.

 of the mass shootings in the U.S. in recent years have roots in domestic violence against partners and family members. Depending on how you count, it could be upwards of 50 percent.

We know the Texas gunman, Devin Patrick Kelley, was 

 for assaulting his wife and their young child in 2012, although this information apparently was 

 in the formal government database that tracks such things.
There are 

 preventing convicted domestic violence offenders from obtaining weapons. So why does this keep happening?
There are no easy answers. NPR's Alison Kodjak recently talked with 

, director of the Johns Hopkins Center for Gun Policy and Research in Baltimore, Md., about the complexities of gun violence, mass shootings, and the difficulty we have in understanding the people who commit these crimes.

While perpetrators of domestic violence account for only about 10 percent of all gun violence, they accounted for

 of mass shootings between 2009 and 2016, according to the advocacy group Everytown for Gun Safety, so there is a disproportionate link, Webster tells Kodjak.


"Generally, it fits a pattern of easy access to firearms of individuals who have very controlling kind of relationships with their intimate partners and are greatly threatened when their control is challenged," he says.

And yes, there are laws preventing convicted abusers from getting guns, but there is a "girlfriend loophole."

"In our current times, many young people put off marriage for many years," he says, and these domestic partners aren't protected by many existing laws that are largely aimed at spouses and children.

There are a few obvious signs that someone is considering mass murder.

"Individuals who are amassing a number of weapons and a large amount of ammo, that obviously is a red flag. Individuals whose violence generally extends beyond the family would be an indicator of greater danger," Webster says.

But even though mass shootings have become more common over time, it's hard to pull together a specific profile that fits every shooter.

, who killed 59 people last month, didn't have a record of domestic violence and didn't show obvious signs of mental illness, Webster adds.


"Look, this is imperfect science — this is social science — predicting a relatively rare phenomenon in large populations of people," he says.

NPR's Alison Kodjak contributed to this report. Find her on Twitter 

. April Fulton is an editor and contributor on NPR's science desk. Find her on Twitter 

Crime, Law and Justice

April Fulton

Author

The man who police say killed 26 people in a small Texas church on Sunday had a record of domestic violence, making him sadly typical. Many suspects of mass shootings have similar histories.

In Texas and beyond, mass shootings have roots in domestic violence

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