Darabont, known for his feature film work, served as director, executive producer and showrunner during the first season of the hit AMC series. News recently broke that Darabont left his post as showrunner and there's no word on what role -- if any -- he will have with the show.
Mazzara, whose credits include 'The Shield' and 'Criminal Minds: Suspect Behavior,' was hired as executive producer for Season 2.
'The Walking Dead' is based on the popular comic book series by Robert Kirkman and Charlie Adlard, and tells the tale of a group of survivors fighting to stay alive in a zombie apocalypse.
After the first season there were rumors of writing staff layoffs and creative turmoil, but Kirkman cleared things up and said the original plan for the series saw Darabont acting as showrunner for Season 1 and then moving on. Charles "Chic" Eglee was supposed to take over, but then Darabont changed his mind and stayed with the series and Eglee quit.
"Chic Eglee is a high-level television writer. He was brought onto 'The Walking Dead' with the idea that Frank was going to work on the first season and then go off and do movies," Kirkman said.
"Chic didn't want to be second-in-command on a show when he's used to being a top dog, and so he decided to go off and do something else, which is something that happens and is not a big deal."
Season 2 of 'The Walking Dead' is still on target for its Sun., Oct. 16 premiere date.