She was fired because because she wanted the new host of Fox and friends fired as part of her new contract.She probably was also negotiating with CNN at the same time
Ah, yes, your right! She wanted Gretchen Wilson job, which Wilson got from E D Hill, who Chetry thought she'd be first choice to replace.
It was Paula Zahn who was doing the secret salary negotiation, if my now coffee-enfused memory now remembers!