The video then cut off but, according to police, the girl immediately lost control of the high powered Uzi as it recoiled and jumped skyward.
She maintained her grip but it raised up above her head and at least one bullet struck Vacca in his head. He was airlifted to hospital in Las Vegas where he was pronounced dead.
Mohave County Sheriff Jim McCabe described the full unedited video as "ghastly" and added: “The guy just dropped."
The girl was on holiday with her parents from New Jersey and they had stopped at Bullets and Burgers, which is in Arizona, between the Grand Canyon and Las Vegas, Nevada.
Sheriff McCabe said no one would be charged with a crime because the gun range was fully licensed.
It is illegal for children under the age of 18 to carry a gun in Arizona but the rule does not apply on private property, or if the youngster is accompanied by a parent or certified instructor.
Vacca, dressed in military-style camouflage trousers, was filmed telling the girl: "Turn this leg forward, there you go, just like that. Alright, go ahead and give me one shot. Alriiiiight! Alright full auto..."
The video then cut off but, according to police, the girl immediately lost control of the high powered Uzi as it recoiled and jumped skyward.
She maintained her grip but it raised up above her head and at least one bullet struck Vacca in his head. He was airlifted to hospital in Las Vegas where he was pronounced dead.
Mohave County Sheriff Jim McCabe described the full unedited video as "ghastly" and added: “The guy just dropped."
The girl was on holiday with her parents from New Jersey and they had stopped at Bullets and Burgers, which is in Arizona, between the Grand Canyon and Las Vegas, Nevada.
Sheriff McCabe said no