On the day of The Mentalist series finale, the show’s co-star Rockmond Dunbar has booked his next series regular gig, signing on as the male lead in the NBC drama pilot Love Is A Four Letter Word. The project, from playwright-TV writer Diana Son, 20th TV and Fabrik, chronicles the collision of race, sexuality and gender roles when three diverse couples put modern marriage to the test.

Dunbar will play half of the lead couple, Nick, a charismatic and charming ad agency entrepreneur whose first marriage to Julie, the mother of two of his children, broke up over his affair with Fiona, now his wife. Nick and Fiona have an open marriage, and Fiona takes full advantage of their “arrangement” — but through the years, Nick has always pined for Julie, the true love of his life. Dunbar, repped by DBA and Levity Entertainment Group, also is coming off a recurring role on Sons Of Anarchy.