KINGMAN, Ariz. (AZFamily/Gray News) — The parents of a 13-year-old girl are speaking out after she died following an ATV accident on Father’s Day. Myah Dennis, who was about to enter the eighth grade, was riding on the back of a 750cc quad on June 21 when the ATV flipped after hitting a large rut. Her 16-year-old sister, Kaitlyn, was driving. Both girls were wearing helmets. The ATV pinned both sisters to the ground.