Alvarado fired his weapon, killing an unarmed 14-year-old boy.
The November incident was not the first time the officer had ignored an order, according to records recently obtained by the San Antonio Express-News.
Alvarado was suspended at least four times, and his supervisors warned of impending termination four times — once even recommending it.
But Alvarado, 46, never was fired. Six months after the death of student Derek Lopez, as an investigation into the shooting continues, the 17-year veteran of the Police Department remains with the school district.