In an excerpt from the new book ‘The Darkest White: A Mountain Legend and the Avalanche That Took Him,' author Eric Blehm details Kelly's rise as an unlikely hero in the fledgling sport of snowboarding, and the fatal day an avalanche swept him and six others away. An excerpt from Eric Blehm's forthcoming book, The Darkest White, about snowboarding legend Craig Kelly and the avalanche that killed him in 2003