The actor-hip hop artist has finalized a deal for a multi-episode arc on the sixth season of the Showtime thriller. Mos Def has finalized a deal for a multi-episode arc on the sixth season of Dexter, according to sources. The actor and hip hop artist, who now goes by just Mos, will play a hardened ex-con who claims to have found religion yet seems to continually find himself surrounded by violence. Michael C. Hall’s Dexter will reveal the truth of who he really is. Production on the sixth season of the Showtime drama thriller begins in June with an eye toward a fall bow. Mos joins Colin Hanks — who will appear in all 12 episodes — as one of the upcoming season’s villains. Hanks will play Travis, Dexter’s main nemesis and a highly intelligent ancient artifacts expert who is linked to a series of grisly murders in Miami. At this point it is unclear in how many episodes Mos will appear. But he is one of multiple recurring characters who will populate the show after the dispatching of season five guest stars including Jonny Lee Miller, Julia Stiles and Peter Weller. Mos has built an eclectic career in theater, TV and film with roles in Spike Lee's Bamboozled, Monster's Ball, The Italian Job, The Hitchhiker's Guide To The Galaxy and the romantic comedy Brown Sugar, for which he received an NAACP Image Award nomination. In addition, Mos has served as the host, music supervisor and co-executive producer for the HBO series Def Poetry. He made his Broadway debut in the Tony nominated, Pulitzer Prize winning, Topdog/Underdog and he just completed a run of A Free Man of Color at New York's Lincoln Center opposite Jeffrey Wright. He has also appeared in numerous television series including House, The Boondocks and the kid’s show Yo Gabba Gabba! Dexter continues to perform well for Showtime and ordering a sixth season of the series was one of the first moves for Showtime entertainment president David Nevins upon taking the job last year. Dexter’s fifth season was its most-watched to date averaging over 5 million viewers a week (in linear and on-demand plays). The fifth season finale rivaled season four’s cliffhanger closer, pulling in 2.5 million viewers on its first airing.