since been released on bond. “I can’t think of anything more tragic,” a lawyer for Mr. Williams, Casey Keirnan, said of the killing. But, he said, “my client denies that he is the person who shot him.”

The case drew widespread attention in Texas, as did another in Houston involving a 9-year-old girl, Ashanti Grant, who was shot and seriously wounded in February while riding with her family to a grocery store.

“It is unique to this moment,” Mr. Turner said. “I’m a native Houstonian. I’m in my seventh year as mayor. We have just not had it to the point where it has been a noticeable event, except in the last year.”

Mr. Turner said that a string of deadly cases had prompted the city to take steps to reconfigure its traffic cameras to preserve recordings, to eventually help catch roadway shooters.

In Texas, drivers have been allowed to carry firearms without a license in their cars since 2007, a law known as the Texas Motorist Protection Act. A new measure, enacted last year, allows most Texans to carry a handgun in public without a license.

Online, there are videos and trainings that offer tips for carrying and using a gun inside of a car.

placed in a medically induced coma. “It was a cut-off type deal,” he said.

As gunfire erupted, Lieutenant Cones said, Ashanti’s family members in the car got low. But Ashanti, who was watching a video with headphones on, did not.

Mr. Castro, David’s father, said having a gun in the car only made such tragedies more likely.

“What I want people to do,” he said, “is talk to their husband, talk to their brother, talk to their son, and say, ‘Do you really need a loaded weapon in the cab of your vehicle?’”

Alain Delaquérière contributed research.


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