According to the county coroner, there was a shotgun hanging on a gun rack in the truck. As the brother was handing the gun to his girlfriend the gun unintentionally discharged.
The brother told police he had cleaned the weapon and didn't realize the gun had been reloaded.
Halee was shot in the face. She was pronounced dead at the scene.
"It was accidental," said the coroner. "No drugs or alcohol was involved."