A 3-year-old boy fatally shot himself with a gun he found in a car while his family stopped for gas early Wednesday in Tacoma, police said. It was western Washington's third recent shooting by a child.... The Tacoma-area family had stopped for gas about 12:30 a.m. The father put his pistol under the seat and got out to pump gas while the mother went inside the convenience store, Benjamin said. They left their son and their infant daughter in the car. The boy climbed out of his child seat, found the gun and shot himself in the head.