It was announced last month that the zombie drama's six-part first season would be followed by a longer 13-episode run in 2011.
Deadline now claims that Darabont has chosen to axe his writing staff, which includes former The Shield writers Charles Eglee, Glen Mazzara and Adam Fierro, and instead assign scripts to freelance writers.
An unnamed source is said to have insisted that all options are being kept open, including the possibility of combining established writers with freelancers, further suggesting that no final decision had yet been made.
The report also claims that Darabont's apparent decision could prove unpopular with the Writers Guild of America.
The second season of The Walking Dead is currently expected to premiere on AMC in October 2011.