Many were surprised to learn yesterday that series creator/executive producer/director Frank Darabont had stepped down as showrunner on AMC's massively popular series The Walking Dead. Refusing to let the news hamper business as usual, the network has now promoted Darabont's number two, Glen Mazzara, to the position of showrunner. Mazzara joined the series near the end of 2010 (penning the episode "Wildfire") and has previously worked on shows such as The Shield, Criminal Minds: Suspect Behavior, and Hawthorne.News of Mazzara's promotion comes courtesy of EW. The report mentions that it is still unclear what role Darabont, who is currently under a two-year contract, will contribute to Dead (perhaps a consultant?). The show is currently shooting its second season in Georgia with the premiere scheduled for Sunday, October 16th.