When "The Walking Dead" showrunner Frank Darabont <a href="http://www.uproxx.com/tv/2011/07/whoa-walking-dead-showrunner-quits">abruptly quit in the middle of production</a> for the show's second season -- just days after promoting the zombie series at Comic-Con -- fans were puzzled that the man who spent five years getting the beloved comic adapted to TV would just walk away from AMC's most-watched show.