Runner has fatal medical emergency during grueling 250-mile Cocodona ultramarathon in Arizona

The Cocodona is one of the toughest ultramarathons in the US, featuring a course that rises more than a mile in elevation — twice — across Arizona.

Runner has fatal medical emergency during grueling 250-mile Cocodona ultramarathon in Arizona
The Cocodona is one of the toughest ultramarathons in the US, featuring a course that rises more than a mile in elevation — twice — across Arizona.