Officials say avalanche ##s , holding out little hope two people are still alive . Third hiker , 26-year - old Luke Gullberg , was found dead , from drowning . Operations coordinator says heavy snowfall has covered up clues to hikers ' deaths .
Officials cite avalanche threat , hold out little hope two hikers are still alive . Third hiker , 26-year-old Luke Gullberg , was found dead Saturday from hypothermia . Operations coordinator says heavy snowfall has covered up clues to hikers ' whereabouts .