A'Sharad Hett was a member of the Old Jedi Order who survived Order 66, living on through the time of the Galactic Empire, the New Republic, and into the Yuuzhan Vong War. While on a Yuuzhan Vong ship in 25 ABY, the Vong tortured him and experimented on him. He was unable to survive the encounter.
Behind the scenes[]
Author Darth Dominion created his version of the canon A'Sharad Hett, otherwise known as the Sith Lord Darth Krayt, on May 4, 2010, on the Star Wars Fanon wiki. The idea was to present a version of Hett who died before becoming Darth Krayt, and thus the One Sith never existed.