Karn Graznor was the captain of the pirate ship, Sable II. He was greedy and did not share the booty fairly with his crew. As a result a large portion of his crew, led by Drek Drednar jumped ship, stole a Corellian corvette, chased him down, and defeated him in a space battle, killing him and destroying the Sable II.
Sources
"Stand and Deliver" — Star Wars Adventure Journal 5 (First mentioned)
