By Nick Selbe The Celtics icon and civil rights champion leaves behind a storied legacy as one of the most accomplished players in sports history. Celtics legend and 11-time NBA champion Bill Russell died on Sunday, his representatives announced in a statement. He was 88 years old. Russell led the University of San Francisco to two national championships before embarking upon an unparalleled NBA career. The Celtics acquired his rights after the St. Louis Hawks selected him with the No. 2 pick in the 1956 draft, and he led Boston to a run of dominance unmatched in professional sports. Boston wo…