AMC has promoted "The Walking Dead" executive producer Scott Gimple to showrunner of the popular zombie series, The Hollywood Reporter said.
Mazzara cited creative differences with the cable network when he confirmed his departure from the show late last month.
Mazzara replaced showrunner Frank Darabont, who was fired just before the series' Season 2 premiere.
Starring Andrew Lincoln and Norman Reedus, the show is now in the middle of its third season.
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