‘You pulled a gun in front of my kids over a mattress,’ the man said. Then he was shot dead.

It began, police say, as a dispute among neighbors in Abilene, Tex. Two families argued about where to dump trash in an adjacent alleyway. Insults escalated to threats, and a father and son, both armed, allegedly shot and killed a 37-year-old man who lived next door in an encounter captured on camera.