Jesse D. Garrabrant/NBAE via Getty Images Former NBA champion and All-Star Sam Cassell is joining the Boston Celtics' coaching staff after spending the last few years with the Philadelphia 76ers, according to The Athletic's Shams Charania.Cassell, 53, is one of the highest-regarded assistants in the league and spent the last three seasons in Philadelphia working under Doc Rivers, who was fired by the organization on May 16.
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