Climbers were on an icy Alaska mountain when they saw a man in their group fall 3,000 feet to his death in Denali National Park, officials said. Alex Chiu, 41, of Seattle died June 2 after falling from Mount McKinley’s West Buttress climbing route, the National Park Service said in a June 4 news release.

Mount McKinley, also known as Denali, is the tallest mountain in all of North America and the tallest mountain in the world from base to peak on land. It's the third most prominent peak in the world, trailing only Mount Everest and Aconcagua in the Andes mountains.