A Texas Highway Patrol trooper was killed in a collision with a tractor-trailer Wednesday. Trooper Sergio Romero was trying to pull over a vehicle at about 4 p.m. near Childress when the crash happened, according to the Department of Public Safety. As he was attempting the stop, a tractor-trailer pulled out in front of Romero, leading to a collision between the semi and Romero's cruiser. Romero, 27, was pronounced dead at the scene.