Mazzara stated that Darabont was booted from The Walking Dead because of a personal rift between Darabont and Robert Kirkman, as well as Darabont and AMC.
There have been conflicting accounts of why exactly Frank Darabont was fired from The Walking Dead during Season 2.
Darabont also gained support from Glen Mazzara, who took over showrunning duties after his departure.
According to a deposition from Darabont, AMC accused him of not meeting with directors as required of him.