The basketball world is in mourning. Don Nelson, the Hall of Fame coach and five-time NBA champion, passed away peacefully on Sunday morning at the age of 86, surrounded by his loving family.

Nelson's family released a statement confirming the news: "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. Throughout his last week, friends and family encircled him with love, sharing the blessing of his friendship and revisiting treasured memories."

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Known affectionately as "Nellie," Nelson's impact on the game of basketball is immeasurable. He coached the Milwaukee Bucks, New York Knicks, Dallas Mavericks, and Golden State Warriors over a legendary coaching career that spanned more than three decades. He also had a stellar playing career with the Los Angeles Lakers and Boston Celtics, winning five championships with the Celtics in the 1960s and 70s.

As a coach, Nelson was a three-time NBA Coach of the Year and is widely considered one of the top 10 to 15 head coaches in league history. His innovative "Nellie Ball" style—characterized by small-ball lineups, fast pace, and positionless basketball—was ahead of its time and influenced generations of coaches.

Nelson's most notable coaching achievement came with the Warriors, where he led the team to a stunning upset of the top-seeded Dallas Mavericks in the 2007 playoffs, the first No. 8 seed to win a seven-game series in the NBA. He also coached the Mavericks for eight seasons, helping develop Dirk Nowitzki into an MVP and future Hall of Famer.

Fans and colleagues alike took to social media to pay tribute. One fan wrote, "Rest in Peace to a legendary NBA coach and player. Honor to have been able to cover him during his Mavericks and Warriors days. Condolences to Donnie Nelson and family." Another added, "Such a legend. Rest in peace, Coach Nelson."

The Dallas community holds Nelson in especially high regard. "The City of Dallas will be forever grateful to Don Nelson for bringing us Dirk. Rest easy legend," one fan posted. Another recalled, "He turned the worst team of the 90's into a winning machine that played the most entertaining of ball and of course brought Dirk into our lives. What a legacy."

Nelson's passing comes as the sports world reflects on the recent health battles of other legends, and his death adds to a somber year for the upcoming Hall of Fame class.

Our thoughts are with Don Nelson's family, friends, and the countless fans whose lives he touched through his incredible contributions to basketball.