Three actors upgraded to series regulars on The Walking Dead + Melissa Ponzio to recur

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AMC's The Walking Dead is firming up its ranks for season four.

Just days after the zombie drama's bloody season three finale, the series based on the comics created by Robert Kirkman has promoted three familiar faces to series regular.

New additions Chad Coleman (Tyreese), Sonequa Martin-Green (Sasha) and Emily Kinney (Beth) will rejoin the series full-time when The Walking Dead returns in October, The Hollywood Reporter has learned. They join David Morrissey(the Governor) as regulars as the series will start off next season at the newly repopulated prison.

In addition, Melissa Ponzio -- who played Karen, the lone survivor of the Governor's attack on his own Woodbury army who helped bring peace between Tyreese and Rick in the finale -- will return to the series as a recurring guest star in season four.