Robert Kirkman, left, and David Alpert participate in "The Walking Dead" panel 

Robert Kirkman, left, and David Alpert participate in "The Walking Dead" panel on Day 3 of Comic-Con International on Friday, July 19, 2103, in San Diego. (Photo by Jordan Strauss/Invision/AP)
Associated Press
Robert Kirkman, left, and David Alpert participate in "The Walking Dead" panel on Day 3 of Comic-Con International on Friday, July 19, 2103, in San Diego. (Photo by Jordan Strauss/Invision/AP)
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