AMC has renewed "The Walking Dead" for a ninth season with a new showrunner. Despite ratings falling over time, the popular zombie series remains one of the most-watched shows on television. Currently in its mid-season break for season 8, AMC has announced that current showrunner Scott Gimple has been promoted to a new position overseeing all 'Walking Dead' related content, while Angela Kang will move up from executive producer to showrunner.