AMC’s The Walking Dead companion series has found its female lead. The Hollywood Reporter has confirmed that following an extensive casting search, Gone Girl and Sons of Anarchy alum Kim Dickens will co-star in the prequel series from Walking Dead creator Robert Kirkman and showrunner Dave Erickson. The project, also known as Cobalt, takes place in Los Angeles at the dawn of the zombie apocalypse. Dickens will play the role of Nancy Tomkins, a guidance counselor who works with and is dating Cliff Curtis’ Sean Cabrera, the main character of the series. Nancy has two kids but it’s unclear what happened to her husband. She has a troubled past that will come up later in the series.