Dominic Blackwell was one of the first friends Mia Tretta made when she moved to the Santa Clarita Valley, near Los Angeles, in 2018. “He had this infectious laugh,” she said. The two were walking through the quad at Saugus High School on the morning of Nov. 14, 2019 — Tretta remembers being nervous about...

Miah Cerrillo was one of the first children Dr. Roy Guerrero saw when he entered the emergency room at Uvalde Memorial Hospital on May 24. A pediatrician, he’s known the fourth grader since she was a baby and underwent the liver surgeries that saved her life. Both testified Wednesday before a House Oversight Committee addressing...