Dalton Williams of Pierre is dead after a fight with his friend over a paintball game.
A 16-year-old witness who was hanging out with the boys told detectives that Williams and the other boy began to wrestle around jokingly after arguing about a paintball game.
The accused shooter then retrieved a semi-automatic shotgun, walked into the kitchen area and pointed it at the witness, according to the arrest affidavit.
The witness said he heard the gun click, then saw the accused shooter take a shotgun shell from a drawer, load the gun and point it at him again. The witness said he then heard another click, according to the affidavit.
The witness told police he was trying to leave the house through a sliding glass door when Williams stepped in between him and the accused shooter. The witness told detectives that the gun fired and he observed a splatter, according to the affidavit.
The witness then left the house and called 911.