The trial of former Uvalde school police officer Adrian Gonzales is underway Monday, four years after 19 students and two teachers were killed in a shooting at a Texas elementary school.

The trial of former Uvalde school police officer Adrian Gonzales is underway Monday, four years after 19 students and two teachers were killed in a shooting at a Texas elementary…

A witness said Tuesday that she saw the shooter on the south side of the school, something she had apparently never revealed before.

Adrian Gonzales' lawyers sought a mistrial due to concerns that a witness' testimony had new details not previously shared with the defense.