FILE: Don Nelson, who won five NBA titles as a player with the Boston Celtics, and went on to be named Coach of the Year three times, has died at the age of 86. 24 Apr 2001: Head coach Don Nelson of the Dallas Mavericks instructs his team in game 2 of the NBA Playoffs against the Utah Jazz at the Delta Center in Salt Lake City, Utah. The Jazz defeated the Mavericks 109-98. DIGITAL IMAGE. Mandatory Credit: Matthew Stockman/Allsport