A man died while riding a motorcycle at the Jeeps Motorcycle Raceway in Valley Center.
It was reported shortly after 4:30 p.m. Friday afternoon at the raceway near the exit ramp for 101st Street near I-135.
Park City police said a man, 78, was riding on the track by himself. His family noticed he had been gone longer than normal, and they went to look for him.
They found him and began CPR, but he was pronounced dead at the scene by EMS. Investigators say it's unclear if he died due to a medical condition or a crash.
No names have been released. The incident remains under investigation.