Don Nelson, Hall of Fame NBA coach and Celtics champ, dead at 86 New York PostDon Nelson Dies at 86, Hall of Famer Won 5 NBA Titles as Celtics Player, 3 Coach of the Year Awards Bleacher ReportNBA coaching pioneer, Hall of Famer Don Nelson dies at 86 USA TodayDon Nelson, the second-winningest coach in NBA and Dallas Mavericks history, dies at 86 Dallas NewsDon Nelson, 5-time NBA champion and pioneer of ‘Nellie Ball’ as coach, dies at 86 The New York Times