The man, from Lakewood, collapsed about 2.5 miles from the trailhead at an elevation of more than 10,000 feet above sea level, according to park officials.
Park dispatch was contacted from the Longs Peak emergency phone, located at the trailhead, at 2:25 p.m. The caller indicated that a man was receiving CPR on the trail. Rangers started up the trail approximately 30 minutes after the initial report.
Rangers reached the man at 4:20 p.m. After consulting with the park’s medical adviser, a physician at Estes Park Medical Center, the man was pronounced dead at 4:40 p.m.
The victim's name will be released after other family members are notified.