Noted basketball coach Don Nelson, who holds the second-highest win count in NBA history and was a five-time champion as a player with the Boston Celtics, passed away on Sunday at the age of 86. His family confirmed his death in a statement but did not disclose the location or cause. Known for his innovative coaching style, Nelson served as general manager and head coach for three franchises - Milwaukee, Dallas, and Golden State. He was a three-time Coach of the Year, made the playoffs 18 times over 31 seasons, and introduced the concept of the 'point forward.' His fast-paced offenses were most prominently displayed during his tenure with the 'Run TMC' era Golden State Warriors. Nelson played 11 seasons with the Celtics, winning five championships under four different coaches. He began his coaching career in Milwaukee after retiring as a player and went on to coach the Bucks for 11 seasons, leading them to seven straight division titles. Nelson's influence on basketball continues to be felt today, with current Warriors coach Steve Kerr calling him a true innovator whose impact on the modern NBA is significant. His coaching legacy includes developing Steve Nash into an elite point guard and mentoring Stephen Curry in his rookie season. Nelson's son, Donnie, joined him as an assistant coach with the Dallas Mavericks, later becoming general manager and remaining with the organization until 2021. One of Nelson's most memorable achievements was leading the 'We Believe' Warriors, led by Baron Davis, to a shocking first-round playoff victory over Dirk Nowitzki and the top-seeded Dallas Mavericks in 2007.