Production on the fourth season of the zombie apocalypse series "The Walking Dead" began this week in Atlanta, AMC announced.

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Based on the comic book series created and written by Robert Kirkman, the ratings hit is to return in October.

It stars Andrew Lincoln as a former sheriff and single father trying to protect a group of survivors from the legions of the undead.

It co-stars Norman Reedus, David Morrissey and Danai Gurira.