A 12-year-old University City boy has shot and killed his friend with his Grandfather’s gun.

Police say the boy and his friend found the handgun in an unlocked bedroom at his grandfather’s house, where the boy lives.

He has told the police he was playing with it and it went off, hitting the other 12-year-old boy in the head. The boy who was hit died at the hospital. Investigators say they are treating the case as an accidental shooting.