Link: http://www.adn.com/news/alaska/butcher/story/8049305p-7942245c.html

Susan Butcher, a four-time winner of the Iditarod, who had been battling leukemia for over a year, lost her fight with the disease on Saturday in Seattle.
She had been battling graft-vs-host disease following a bone marrow transplant in May. More recently, doctors diagnosed that her leukemia had returned, and she had re-started chemotherapy to prepare for a second bone marrow transplant. The combined effects of the GVHD and the chemo were too much even for her legendary resilience.
Follow the tributes on ADN, her official web site and other media outlets.