BREAKING: Don Nelson, the second-winningest coach in NBA history who won five championships as a player with the Boston Celtics, has died at 86. https://www.nbcnews.com/news/us-news/don-nelson-second-winningest-coach-nba-history-dies-86-rcna591608?taid=6a78d0f573bffa000183aeee&utm_campaign=trueanthem&utm_medium=social&utm_source=twitter