The Boston Celtics offered their deep condolences following the announcement that Don Nelson had died at the age of 86. Nelson is best known as a Hall of Fame coach, but he had a 14-year playing career in the NBA that included 11 years with the Boston Celtics. A favorite of Red Auerbach’s, “Nellie” was a tough and reliable all-around player whose tenacity and ability to “think the game” was on full… pic.twitter.com/cWJOIxso3c — Boston Celtics (@celtics) August 9, 2026Nelson played a key role in helping the Celtics win five NBA championships. Nelson impacted the NBA for more than 40 yearsThe Celtics posted their memory of Nelson's memorable contribution on X. He coached the Bucks for 11 seasons, the Warriors for 11 seasons, the Knicks for 1 season and the Mavericks for 8 seasons.