Everest Sherpa Babu Chhiri Sherpa, a guide well known to climbers of Mount Everest has fallen to his death. Noah Adams talks with Heidi Howkins, a mountaineer and author of the book K2: One Woman's Quest for the Summit. Howkins was on a climb with Babu Chhiri when he broke the record for the longest stay at the top of Mt. Everest without bottled oxygen. Babu Chhiri also set a record for the fastest climb of Mount Everest -- 16 hours and 56 minutes. (4:00) K2: One Woman's Quest for the Summit, by Heidi Howkins, is published by National Geographic Adventure Press.