Last week, The Walking Dead has promoted Chad Coleman (Tyreese), Sonequa Martin-Green (Sasha) and Emily Kinney (Beth) to be series regulars. Also, Melissa Ponzio who plays Karen, the only survivor from the Governor’s slaughter of Woodbury residents and mother of the teen that Carl killed, will be a recurring guest star in season 4. Source: hollywoodreporter.com Even if you’re a series regular on The Walking Dead you’re not safe from getting killed off the show.