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OTRC: Edward James Olmos joins 'Dexter' for season 6 (Spoilers)

Edward James Olmos appears in a scene from 'Battlestar Galactica.' (British Sky Broadcasting)

Actor Edward James Olmos is set to join special guest stars Colin Hanks and rapper Mos Def on the upcoming sixth season of "Dexter."

The Showtime drama series features Michael C. Hall as Dexter Morgan, a serial killer who only targets people responsible for murder and who moonlights as a blood spatter analyst at the Miami Police Department.

Warning: Spoiler alert!

Olmos will play a "brilliant, charismatic professor of religious studies," Showtime said in a statement obtained by OnTheRedCarpet.com.

Olmos is known for his role as William Adama in "Battlestar Galactica." He got his big break starring in Luis Valdez's play, "Zoot Suit."

The 64-year-old actor also appeared in "Miami Vice," "Blade Runner," "Selena" and "Stand and Deliver," in which he received a Best Actor Oscar nomination.

Mos, "formerly known as Mos Def," will appear in several episodes and play Brother Sam, a "hardened ex-con who claims to have found religion, yet seems to continually find himself surrounded by violence," Showtime said.

Tom Hanks' son, Colin Hanks, 33, is set to play Travis, an expert on ancient artifacts who gets linked to some murders in Miami, on all 12 episodes, according to Showtime.

Notable guest stars of the past include John Lithgow, who played a killer, and Julia Stiles, who portrayed Morgan's love interest.

The sixth season of "Dexter" premieres in the fall of 2011 and production on it is set to begin in June.

Check out a promo video for season 6 of "Dexter" below.

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