Frisco Davidson-Spurs Yankolovich hit and killed when his dirt bike collides with ATV. ATV driver flees.

Phoenix police are looking for an ATV rider who fled the scene of a fatal dirt bike accident in Phoenix on Tuesday. The vehicles collided in the desert near the 25,000 block of North 57th Street around 5 p.m. The rider of the dirt bike, Frisco Davidson-Spurs Yankolovich, 20, was rushed to a local hospital, where he died of his injuries, said a Phoenix Police Sgt. The rider of the quad stopped and looked at the victim, then left the scene, police said. Police said there are no signs of the ATV rider. He is described as a white man in his 50s. He has long hair and a full beard, which is gray or "salt and pepper," according to witnesses. The witnesses said they frequently see the man riding in the desert, and he has helped construct a number of the off-road jumps in the area. UPDATE: Gregg Creevy has been arrested in conjunction with this accident