Jimel Atkins and Andy Hirsch have also been cast on the HBO drama series. Letts will play Jack McKinney, the brief 1979 Lakers head coach who was the original architect behind the team's fast-paced game. Nicholson will play McKinney's wife Cranny. Hamilton has been cast as Magic Johnson's mom, Christine Johnson. Atkins will play Lakers player Jamaal Wilkes and Hirsch will portray David Stern, the NBA's legal counsel, who would go on to serve as NBA commissioner for 30 years.