Ruth Negga
Justin Lubin - © 2013 American Broadcasting Companies, Inc. Ruth Negga

Ethiopian-Irish actress Ruth Negga (last seen as vixen alongside Samuel L. Jackson in The Samaritan, released last week) joins a now officially confirmed Adepero Oduye (Pariah), as well as newly-cast Paul Dano and Scoot McNairy, to the cast list of Steve McQueen's slave narrative on film, Twelve Years A Slave

Based on Solomon Northrup's non-fictioner, who will be played by star Chiwetel Ejiofor, a once free man, kidnapped and sold into slavery on a Louisiana plantation, in 19th century USA.

Brad Pitt's Plan B is producing the film, which co-stars Pitt himself, as well as Michael Fassbender, both cast early.

No word on what character Adepero will play, but Ruth Negga (gradually making her way Stateside) will play a runaway slave, and McNairy will play one of the circus workers who assists in Northup's kidnapping.

Production is scheduled to begin at the end of June.