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

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. 30 Dec 2000: Head Coach Don Nelson of the Dallas Mavericks reacts to the referee call during the game against the Houston Rockets at the Reunion Arena in Dallas, Texas. The Rockets defeated the Mavericks 114-99. NOTE TO USER: It is expressly understood that the only rights Allsport are offering to license in this Photograph are one-time, non-exclusive editorial rights. No advertising or commercial uses of any kind may be made of Allsport photos. User acknowledges that it is aware that Allsport is an editorial sports agency and that NO RELEASES OF ANY TYPE ARE OBTAINED from the subjects contained in the photographs.Mandatory Credit: Ronald Martinez /Allsport

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. 17 Nov 2000: Head Coach Don Nelson of the Dallas Mavericks yells from the sidelines during the game against the Seattle SuperSonics at the Key Arena in Seattle, Washington. The Mavericks defeated the Sonics 99-95. NOTE TO USER: It is expressly understood that the only rights Allsport are offering to license in this Photograph are one-time, non-exclusive editorial rights. No advertising or commercial uses of any kind may be made of Allsport photos. User acknowledges that it is aware that Allsport is an editorial sports agency and that NO RELEASES OF ANY TYPE ARE OBTAINED from the subjects contained in the photographs. Mandatory Credit: Otto Greule Jr. /Allsport

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. 1989: Head coach Don Nelson of the Golden State Warriors looks on during an NBA game in the 1989-90 season. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by: Ken Levine/Getty Images

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. 27 Mar 2000: Head Coach Don Nelson of the Dallas Mavericks yells on the court during the game against the Utah Jazz at the Delta Centerin Salt Laker City, Utah. The Mavericks defeated the Jazz 113-105.

(FILES) Golden State Warriors coach Don Nelson watches the action as the Warriors play the Milwaukee Bucks during an NBA preseason exhibition game in Beijing on 18 October, 2008 at the Beijing Basketball Arena. The Golden State Warriors defeated the Milwaukee Bucks 109-108. AFP PHOTO/Frederic J. BROWN. 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 Frederic J. BROWN / AFP via Getty Images)

​FILE - AUGUST 09: Don Nelson, the second-winningest coach in NBA history who won five championships as a Boston Celtics player, died on August 9. He was 86. Don Nelson, Head Coach for the Golden State Warriors looks on from the sideline with hands on hips during the NBA Pacific Division basketball game against the Los Angeles Lakers on 18th November 1990 at the Great Western Forum arena in Inglewood, Los Angeles, California, United States. The Lakers won the game 115 - 93. (Photo by Ken Levine/Allsport/Getty Images)

​FILE - AUGUST 09: Don Nelson, the second-winningest coach in NBA history who won five championships as a Boston Celtics player, died on August 9. He was 86. Don Nelson, Head Coach for the Milwaukee Bucks gives out hand sign instructions to his players during the NBA Pacific Division basketball game against the Los Angeles Lakers on 23rd November 1986 at The Forum arena in Inglewood, Los Angeles, California, United States. The Lakers won the game 127 - 117. (Photo by Otto Greule Jr/Allsport/Getty Images)