SAN FRANCISCO: Don Nelson, the second-winningest coach in NBA history and a five-time champion as a player with the Boston Celtics, died on Sunday, his family announced. "Don Nelson revolutionized NBA basketball through his fearlessness, ingenuity and deep conviction," NBA commissioner Adam Silver said in a statement. "The Golden State Warriors mourn the passing of Hall of Fame head coach Don Nelson," the team said in a statement. "Don Nelson revolutionized NBA basketball through his fearlessness, ingenuity and deep conviction," NBA commissioner Adam Silver said in a statement. "The Golden State Warriors mourn the passing of Hall of Fame head coach Don Nelson," the team said in a statement.