Taniguchi, who climbed Mount Everest in 2007, became the first woman to win the prestigious Piolet d'Or (Golden Ice Axe) mountaineering award in 2009. A friend and fellow climber, Hiroshi Hagiwara, said today she fell while taking a break on 1,984 meter (6,510 foot)-high Kurodake as she and four companions were descending the peak.
Taniguchi had untied herself from the rope she and fellow climbers were using, and went behind a boulder. The group found her gloves and traces of her having fallen. She was confirmed dead Tuesday.