Phoenix police say 23-year-old Nathan DeWitt, originally from Mount Vernon, died early Wednesday after being taken to a hospital.
Police and Phoenix Fire crews responded to a rollover crash shortly after midnight and found an SUV on its side.
They say DeWitt crawled out of the vehicle and had been shot.
Police say it's still unclear if DeWitt died from the shooting wound, injuries from the crash or both.
Detectives are trying to determine what happened leading up to DeWitt's death and say he possibly was at Christmas party before the shooting and crash.