Jacob Cable, who is 27, was charged in a fatal crash near Rocky Mountain House in October 2012.
The charges were dismissed Tuesday in Rocky Mountain House provincial court, and now Cable faces just one count of dangerous operation of a motor vehicle.
No date has been set for Cable to return to court.
Police say a truck struck a car with six people inside that was parked along the side of Highway 11 west of Rocky Mountain House.
The crash killed a 20-year-old man who was a passenger in the car.