Mazzara will not return to the hit AMC zombie drama for its fourth season, with some reports suggesting that he was fired from the show due to creative differences.
"When people involved with the show are looking at the long-term plan... they want something different - and what those differences are, you'd have to ask AMC," the writer/producer said.
Mazzara insisted that he is still grateful to have worked on The Walking Dead, despite the circumstances of his departure, according to Deadline.
"I was a hired gun coming in to support the creator of the show and, through odd circumstances, I ended up becoming the showrunner," he explained. "I was just glad that I was able to contribute and not mess up the show, I see that as a win."
Mazzara also addressed the rumours that he left The Walking Dead following a series of creative conflicts with Robert Kirkman, creator of the comic series on which AMC's drama is based.
"When you are the creator you can say, 'This is what the show is' - I didn't create the show [and] I didn't create the comic book, so I was just glad I was able to contribute," he said.
AMC CEO Josh Sapan insisted earlier this month that Mazzara's departure was a mutual decision. Scott Gimple (FlashForward, Life) will assume the role of showrunner on The Walking Dead at the beginning of the show's fourth season.
The second half of season three - Mazzara's final episodes - will air in the US from Sunday, February 10 and on FOX in the UK from Friday, February 15.
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Watch a promo for the return of The Walking Dead below: