So, let’s say you are killed on “The Walking Dead.” Then what? Atlanta-based actor IronE Singleton is proof there’s life after being devoured by ravenous zombies. He was on the AMC show for three seasons until his character’s untimely death. Since his stint on “The Walking Dead,” Singleton created and starred in a one-man show about his life growing up impoverished in Atlanta. We talked with him about his big break and breaking up with the show that made him a star.