Trex was a Trandoshan slaver and Captain of The Krayt Fang, a rusted old YT-1300 light freighter. The Protagonistsneeded a way off Mos Shuuta in their escape from Teemo the Hutt, so they murdered Trex (pictured here with both arms) and hijacked his ship.

Art Credit: http://img4.wikia.nocookie.net/__cb20111223222844/starwars/images/b/bb/Trandoshan_SWGTCG.jpg