UVALDE, Texas — Living across the street for nearly a decade, Ruben Flores watched Salvador Ramos grow up. He’d often come over to play video games and sports with his son, a quiet kid who would respond in quick and short answers. 

“When he was here, he was a normal kid. But once he hit high school freshman year, he totally changed,” Flores told USA TODAY, speaking at his home in a modest neighborhood of the the 16,000-resident town 75 miles from the Mexico border.