(FILES) Head coach Don Nelson of the Dallas Mavericks watches his team during the first half of game five of the NBA Western Conference Finals against the San Antonio Spurs 27 May, 2003 at the SBC Center in San Antonio, Texas. Don Nelson, the second-winningest coach in NBA history and a five-time champion as a player with the Boston Celtics, died on August 9, his family announced. He was 86. Nelson was a member of five NBA championship teams with Boston from 1966 to 1976 and the Celtics retired his jersey number 19. (Photo by JEFF HAYNES / AFP via Getty Images)