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. 28 Apr 2001: Head coach Don Nelson of the Dallas Mavericks signals to his team in game three of round one in the NBA playoffs against the Utah Jazz at Reunion Arena in Dallas, Texas. The Mavericks won 94-91. DIGITAL IMAGE. Mandatory Credit: Ronald Martinez/Allsport