A park ranger fell to his death on Mount Rainier in Washington state Thursday when he tried to help rescue four injured climbers. Nick Hall fell about 3,700 feet down the northeast side of the mountain as he helped prepare the other climbers for a helicopter to lift them to safety. The climbers from Waco, Texas, slipped down the Emmons Glacier, which left two of them dangling in a crevasse. They called for help with a cellphone. None of their injuries were life-threatening.