MEARS, Mich. (AP) - Authorities say a 19-year-old suburban Detroit man is dead and another is injured following an off-road vehicle accident at Silver Lake State Park in West Michigan. The Muskegon Chronicle reports Cody J. Mong, of Oakland County's Oakland Township, died after two people in a group of four riding quads on the park's dunes collided Thursday evening in Oceana County. The two uninjured riders called 911 afterward. Investigators say Mong crashed, was thrown from his vehicle and was hit by a quad driven by another rider. The other rider was taken to a hospital for treatment. The crash is under investigation. Sheriff's Lt. Craig Mast says it was the first time the four riders had been to Silver Lake State Park, located along Lake Michigan.