Another alumni of The Wire has joined the cast of The Walking Dead.

With Chad Coleman (Tyreese) and Larry Gilliard Jr. (Bob) already on board the AMC smash, sources now confirm that Seth Gilliam has been cast as a series regular on The Walking Dead Season 5.

Details on the character are being kept secret at this time, but Gilliam will portray someone with a dark secret and someone with two distinct sides two his personality: one dark, one light.

Sounds familiar to anyone fans of the graphic novels? Preacher Gabriel Stokes, perhaps?

Gilliam played Ellis Carver for five seasons of The Wire and has been recurring on MTV's Teen Wolf. He's expected to continue in that capacity.

Watch The Walking Dead online now in order to catch up prior to the show's return this fall.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.