Morgan is reportedly making his debut as the infamous villain Negan, the leader of the Saviors, at the end of the sixth season.
Jeffrey is just one of the new members in the cast — the show also added Tom Payne, who will play Paul Monroe (a.k.a. Jesus).
Morgan is currently starring in the hit CBS show "The Good Wife." He will also be appearing in "Batman v. Superman: Dawn of Justice," as Bruce Wayne's father.