A police officer in San Antonio, Texas, was fatally shot in the head on Sunday while writing a traffic ticket. The officer was sitting in his car outside the police headquarters when another driver pulled up, got out of the car and shot him twice, according to officials. The suspect fled the scene and is still at large. “This is everyone’s worst nightmare,” said San Antonio police Chief William McManus. “It’s always difficult, especially in this day and age, when police are being targeted across the country.” The officer was a 20-year veteran of the police force.