SPRING, Texas (KTRK) -- A 15-year-old playing with a gun accidentally shot himself in the head, Harris County deputies said.The teen was playing Russian roulette at the time, according to the father of another teen present at the time.It happened around 9:30 a.m. in the 21300 block of Greenham Dr.The other teen's father said that he does not own a gun, and his son called him hysterical to tell him that his friend has been playing Russian roulette.Jason Gay, a neighbor, was shocked to hear what unfolded not too far from his home."This morning I thought I heard two gunshots. I didn't pay no mind to it until I saw the helicopters," said Gay.The teen was taken to the hospital in grave condition.Detectives are investigating where the weapon may have come from.