(Tashi Sherpa | AP file photo) In this March 7, 2016, photo, Mt. Everest, in middle, altitude 8,848 meters (29,028 feet), is seen on the way to base camp. American climber Don Cash who fulfilled his dream of climbing the highest mountains on each of the seven continents by reaching the summit of Mount Everest died of probable altitude sickness on the way down, mountaineering officials said Friday, May 24, 2019. Cash became ill at the summit and was treated there by his two Sherpa guides, one of the officials said.