A young person runs by the Last Stop outdoor shooting range Wednesday, Aug. 27, 2014, in White Hills, Ariz. Gun range instructor Charles Vacca was accidentally killed Monday, Aug. 25, 2014 at the range by a 9-year-old with an Uzi submachine gun. (AP Photo/John Locher)
People are seen at the Last Stop outdoor shooting range Wednesday, Aug. 27, 2014, in White Hills, Ariz. Gun range instructor Charles Vacca was accidentally killed Monday, Aug. 25, 2014 at the range by a 9-year-old with an Uzi submachine gun. (AP Photo/John Locher)
In this Aug. 25, 2014 image made from video provided by the Mohave County Sheriff Department, firing-range instructor Charles Vacca, left, shows a 9-year old girl how to use an Uzi. Vacca, 39, was standing next to the girl on Monday at the Last Stop range in Arizona, south of Las Vegas, when the girl squeezed the trigger, causing the Uzi to recoil upward and shoot Vacca in the head. (AP Photo/Mohave County Sheriff Department)
An employee smokes outside of an office for the Last Stop outdoor shooting range Wednesday, Aug. 27, 2014, in White Hills, Ariz. Instructor Charles Vacca was accidentally killed at the range by a 9-year-old with an Uzi submachine gun. (AP Photo/John Locher)
A man closes off an entrance to the Last Stop outdoor shooting range Wednesday, Aug. 27, 2014, in White Hills, Ariz. Gun range instructor Charles Vacca was accidentally killed Monday, Aug. 25, 2014 at the range by a 9-year-old with an Uzi submachine gun. (AP Photo/John Locher)
Coroner Mike Murphy said Thursday that the results of blood toxicology tests didn’t change a preliminary finding that Charles Joseph Vacca Jr.’s death from single gunshot to the head was an accident.