Charles Vacca, 39, was working as a firearms instructor at the Last Stop outdoor shooting range in White Hills, Arizona, on August 25, 2014. That morning he was showing a nine-year-old girl, who was visiting the range with her parents, how to use a 9mm Uzi submachine gun. After demonstrating a single shot, the weapon was set to fully automatic. When the girl pulled the trigger the recoil sent the gun upward and a stray bullet struck Vacca in the head.

The shooting was captured on video by the girl’s parents. Vacca was airlifted to the University Medical Center in Las Vegas and died later that evening. The Mohave County Sheriff’s Office investigated and ruled the shooting a tragic industrial accident; no criminal charges were filed. Vacca’s family later filed a wrongful death lawsuit against the shooting range.

If anyone was at the Last Stop range on August 25, 2014, or has information about the range’s safety procedures that day, please share what is known.