Frank Darabont helped take a comic book from ink and paper to our television screens turning it into a cable smash hit currently in its fourth season. However he only was around for the first season. AMC fired the then executive producer of the show with rumors he couldn't handle the television production schedule but eventually revealed to be a part of reduced budgets and general disagreements Darabont had with some at AMC. Now, years later, Darabont and his talent agency are suing AMC.
The lawsuit says AMC has, through some shady practices, been short changing Darabont for years. It claims his firing from the show was wrongful and he should still be accredited on the show as well as receive the profits and executive producer would be entitled to. The suit also says he should be getting payments from Walking Dead offshoots like Talking Dead. The amount owed isn't specified but considering how big of a hit Walking Dead is it probably isn't chump change.
The Deadline piece linked below goes into much more detail about what the suit claims and the history between Darabont and AMC. There does seem to be some ground for the lawsuit to stand on but it may be hard to prove he still deserves to be receiving credit on the show. Granted, I'm no lawyer. More than likely this lawsuit won't ever reach a court and I would hope AMC would recognize it has to pay for its mistakes.