UPDATED, 3:06 PM: Gbenga Akinnagbe also has joined the cast of FX’s American Crime Story: The People V. O.J. Simpson, Deadline has learned exclusively. He will play Dennis Schatzman, the journalist who jumped on the O.J. Simpson soapbox to cry out about the LAPD’s war against African-Americans. Akinnagbe recurred on The Wire, and recent credits include 24: Live Another Day, The Good Wife, Nurse Jackie and The Taking Of Pelham 1 2 3. He is repped by APA, Silver Lining Entertainment, and Nelson Davis LLP.

PREVIOUSLY, 2:25 PM: Bruce Greenwood is set to play Los Angeles District Attorney Gil Garcetti on American Crime Story: The People V. O.J. Simpson, the first installment of Ryan Murphy’s latest anthology series for FX. Based on the book The Run Of His Life: The People v. O.J. Simpson, ACS: O.J. tells the story of the O.J. Simpson murder trial from the perspective of the lawyers. It explores the chaotic behind-the-scenes dealings and maneuvering on both sides of the case and how a combination of prosecution confidence, defense wiliness and the LAPD’s history with the city’s African-American community gave a jury what it needed: reasonable doubt.

Greenwood joins a cast that includes Cuba Gooding Jr. as Simpson, John Travolta as defense attorney Robert Shapiro, David Schwimmer as defense attorney Robert Kardashian and Sarah Paulson as prosecutor Marcia Clark. Production on the series from Fox 21 Television Studios and FX Productions is underway in Los Angeles. Murphy is directing the first episode and serves as EP with Nina Jacobson, Brad Simpson, Scott Alexander, Larry Karaszewski and Brad Falchuk.

Greenwood most recently appeared as Joan’s wealthy suitor Richard in the final episode of Mad Men. The veteran actor’s recent credits also include the features Good Kill, Elephant Song and The Captive. He is repped by Gersh and Binder & Associates.