The shooting instructor killed after letting a 9-year-old girl fire an Uzi was hit by a single bullet when she lost control of the weapon, the coroner says. Charles Vacca, a 39-year-old instructor at Arizona's Bullets and Burgers, was killed by a gunshot wound to the head, the coroner tells NBC. The Mohave County Sheriff's Office says that after reviewing a video of the incident, it has decided not to press charges. The shooting is being treated as an industrial accident and will be reviewed by the Occupational Safety and Health Administration, the Arizona Republic reports. The business owner says the death is the first accident in the shooting range's 14-year history.