David Sharp died inside "Green Boots Cave" (Named after another frozen climber). During his attempt in 2006, he encountered problems and was soon unable to move as result of the frigid conditions. Over 30 climbers passed him during while he was dying. Someone moved him to the sun where he could thaw out, but efforts were fruitless as he soon died.
Mummification
Just as the rest of the bodies on Mount Everest, extreme cold allowed for Sharp to be perfectly preserved.
Pathology
He died as a result of a combination of faulty equipment, poor conditions, and to exposure. Soon after he achieved the summit, Sharp began his decent (the most dangerous part of the climb), where he was forced to traverse the mountain with a broken head lamp and a frozen oxygen supply. Added to exhaustion ended being fatal.
Additional Info
Sir Edmond Hillary, the first man to make the summit, spoke with outrage about Sharp being left to die while other climbers pushed on to the summit..."he was a human being! We would regard it as our duty to get him back to safety."
David Sharp's body, just like the Green Boots body, is also used as a marker or a checkpoint for other climbers.
External Links
http://altereddimensions.net/2012/dead-bodies-on-mount-everest