Sanchez was a member of Raynor's Raiders, serving as a terran shuttle pilot.
Present on Char when the Raiders traveled there to rescue Sarah Kerrigan, his shuttle was boarded by zerg under the control of the new Queen of Blades. The zerg ripped him to shreds.
Rosenberg, Aaron. StarCraft: Queen of Blades. New York, London, Toronto and Sydney: Pocket Star Books, May 2006. ISBN 0-7434-7133-4