McDonald, who is currently scheduled to appear in one episode, will play Alicia's (Julianna Margulies) "nemesis" from Georgetown Law School, and the two will go head to head in the courtroom.
Other Season Four guest stars include Tony winner Kristin Chenoweth, who departed the season early due to an injury sustained on the set, Tony winner Nathan Lane, Maura Tierney, Marc Warren, Amanda Peet, Christina Ricci and Miriam Shor.
McDonald, who starred as Bess in The Gershwins' Porgy and Bess, won her first Tony Award in 1994 for Carousel, in which she played the role of Carrie Pipperidge. In 1996 she took home the Featured Actress Tony Award for her performance as Sharon in Master Class. She also received Featured Actress Tonys for Ragtime, in which she played Sarah, and A Raisin in the Sun, for the role of Ruth Younger. The 2012 Tony for her role of Bess was her first Best Actress Tony Award.
"The Good Wife" stars Emmy Award and Golden Globe Award winner Margulies as lawyer Alicia Florrick.