Don Nelson, Hall of Fame N.B.A. Coach and Celtics Star, Dies at 86

One of the winningest coaches in league history, he led the Bucks, the Warriors and the Mavericks. He also had a brief stint with the Knicks.Don Nelson in 2000 coaching the Dallas Mavericks. He spent 31 years as a head coach, leading the Bucks, the Golden State Warriors and the Mavericks to the upper echelons of the N.B.A.