BOULDER, Colo. (AP) — An athlete died a day after he was pulled from the water during the Boulder Ironman 70.3 triathlon in Colorado. It was the third death in four years of Ironman competitions in Boulder.

A witness, physician Donald Cain from Wisconsin, told the Daily Camera in Boulder that a man was pulled from the water on Saturday, and Ironman officials say the athlete died Sunday. The Boulder County coroner identified the man as 50-year-old Scott Michaelis, of Wichita, Kansas.

A 70.3 triathlon, or half Ironman, involves swimming 1.2 miles (1.9 kilometers), biking 56 miles (90 kilometers)...