Legendary NBA coach Don Nelson has died at the age of 86, his family announced Sunday. Nelson, a three-time NBA Coach of the Year and five-time champion with the Boston Celtics, died surrounded by his family, according to NBA reporter Marc Stein. “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. Nelson was the second-winningest coach in NBA history, the Associated Press reported. Before the Celtics, Nelson played for the Chicago Zephyrs and Los Angeles Lakers.