Don Nelson, a five-time NBA champion with the Boston Celtics as a player and one of the winningest coaches in league history, died Sunday at 86, his family announced in a statement.
“On Sunday morning our beloved husband, dad, grandfather and great-grandfather Don Nelson peacefully went to be with the Lord, surrounded by his loving family,” the statement read. “Throughout his last week, friends and family encircled him with love, sharing the blessing of his friendship and revisiting treasured memories.”
A cause of death was not shared, but The Dallas Morning News reported that Nelson had a stroke roughly three weeks ago.
The pioneer of “Nellie Ball,” Nelson was inducted into the Naismith Basketball Hall of Fame as a coach in 2012 after posting 1,335 career regular-season victories in the NBA — a win total that trails only Gregg Popovich (1,390) for the league record.
Nelson began his coaching career as an assistant in 1976 with the Milwaukee Bucks and is credited with developing a fast-paced brand of offensive basketball that relied on smaller, more athletic players to seek mismatches and outrun opponents. His success led to his being named to the NBA’s lists of the top 10 (1996) and top 15 (2021) coaches of all time, and his offensive philosophies still influence basketball today.
Nelson served as head coach for four franchises during a 31-season NBA coaching career. That included 11 seasons each with the Milwaukee Bucks (540-344) and Golden State Warriors (422-443), as well as eight seasons with the Dallas Mavericks (339-251) and one campaign with the New York Knicks in 1995-96 that saw him fired with a 34-25 record and replaced by Jeff Van Gundy.
On April 7, 2010, with his 1,333rd victory on the sidelines, Nelson passed Lenny Wilkens to set the NBA record for most regular-season coaching wins before finishing his career with a record of 1,335-1,063, a .556 win percentage.
“We extend our deepest sympathies to Nellie’s family, friends, former players, colleagues, fans and all who knew him,” read a statement from the Bucks, with whom Nelson won two of his three NBA Coach of the Year awards. “He will always be a treasured part of Bucks history and one of the most influential figures the game has ever known.”
Nelson was a central figure in helping resurrect a Mavericks franchise that went 10 straight seasons without a playoff appearance between 1990 and 2000. In 1998, he was instrumental in Dallas acquiring Dirk Nowitzki and Steve Nash in separate draft-night trades, moves that set the stage for the Mavs to become one of the NBA’s highest-scoring and most exciting teams of the early 2000s. The Mavericks reached the Western Conference finals in 2003, and Nelson stepped down two years later with 18 games left in the 2004-05 season.
“You didn’t just draft me. You believed in me,” Nowitzki wrote Sunday in a post on X. “You saw things in my game before I ever realized I could do them. I’ve said it a million times and I will always say it: I don’t think my career could have turned out how it did without you being my first coach and giving me the freedom to play my game. I can only say THANK YOU. For everything.”
While none of the teams he coached won an NBA title, Nelson had 18 playoff appearances and a 75-91 career postseason record. Among his biggest postseason triumphs was his “We Believe” Warriors’ first-round upset of the very same Mavericks he coached just two seasons earlier.
Dallas entered that 2007 postseason as the No. 1 seed in the Western Conference, but Nelson’s eighth-seeded Warriors outsted them in six games before eventually falling to the Utah Jazz in the second round. It was the highlight of Nelson’s second stint with Golden State, where his coaching career eventually ended after the 2009-10 season.
“Nellie left an indelible mark on our franchise with his approach to the game,” a statement from the Warriors read. “From the Run TMC era to the ‘We Believe’ team in 2007, his teams captivated Bay Area basketball fans and created some of the most memorable moments in Warriors history.”
Despite never reaching the mountaintop as an NBA coach, Nelson experienced championship glory in his 14-season NBA playing career, helping the Celtics hang five banners over an 11-year stint. Initially drafted in the third round of the 1962 NBA Draft by the Chicago Zephyrs, Nelson played just one season in the Windy City before being acquired off waivers by the Los Angeles Lakers.
After two unremarkable seasons in L.A., Nelson signed with the Celtics as a free agent in 1965, and his game and role grew. During his first season under new coach Red Auerbach, Nelson posted averages of 10.2 points and 5.4 rebounds to help the Celtics win the 1965-66 championship. He contributed as a sixth man for a roster that included Boston legends Bill Russell, Sam Jones, John Havlicek, Satch Sanders and KC Jones. In 11 seasons as a Celtic, Nelson averaged at least 10 points nine times.
Don Nelson’s success as a Hall of Fame Coach is so vast, that it could overshadow his playing career, but it would be a mistake to do so. 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, 2026
He was even more dangerous in the playoffs, averaging 11.1 points on 50 percent shooting and 4.8 rebounds in 134 career postseason games for the Celtics. He’s among 26 players to win at least five NBA championships — 11 of those players did so with Boston — and his No. 19 jersey was retired by the franchise in 1978.
Auerbach told the New York Times back in 1974 that he had always taken a liking to Nelson as a player, due in part to how he positioned himself on the court.
“But more than that, he has great knowledge of the game,” Auerbach said. “Someday he’s going to be a coach, and a very good one. He knows the game, and he plays it hard.”
Nelson was born on May 15, 1940, in Muskegon, Mich., to Arvid and Agnes Nelson, who raised him and two sisters on his grandfather’s farm close to Sherrard, Ill. The family eventually moved to nearby Rock Island, Ill., where Nelson attended middle school and fell in love with basketball.
He caught the eye of Iowa Hawkeyes coach Sharm Scheuerman after helping lead Rock Island to a 47-7 record over his final two high school seasons and eventually landed in Iowa City. There, Nelson averaged 21.1 points and 10.9 rebounds over three varsity seasons from 1959-62, and was inducted into the University of Iowa Athletics Hall of Fame in 1989. His career scoring average remains a program record.
Nelson is survived by his wife, Joy Wolfgram, whom he married in June 1991. They had six children between them.
The couple moved to Maui, Hawaii, shortly after Nelson finished his coaching career. There, he returned to his farming roots, growing flowers, coffee and marijuana, and often playing cards in his famed poker room through his final years.
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