Sanaa Lathan and Glee heartthrob Jonathan Groff have landed new regular roles on the second season of Starzâ€™s drama series Boss. The Lionsgate TV-produced series stars recent Golden Globe winner Kelsey Grammer as ruthless Chicago mayor Tom Kane. Lathan is finalizing a deal to play Mona, Kaneâ€™s incorruptible new chief of staff, who becomes an obsession for him. Lathan, repped by ICM and John Carrabino, voices the female lead on Foxâ€™s The Cleveland Show and was most recently seen in the feature Contagion. Groff will play Ian Todd, a smart and ambitious staffer in Kaneâ€™s office who steps into the void Ezra Stone (Martin Donovan) has left to offer astute council to Kane. WME-repped Groff is best known for his recurring role as villain-turned-good guy Jesse St. James on the Fox musical dramedy Glee.