Murdoch, the patriarch of Fox's parent company 21st Century Fox, disliked her recent attempt to renegotiate her contract, and the unusual courier visit was a result of that, said one of the sources interviewed for this story.
Van Susteren was motivated to leave in part because she had been unhappy and uncomfortable with the way Ailes ran the network the past few years, and with the way the network was perceived, two of the sources said.
Van Susteren had a 60-day period of time to invoke the escape clause after Ailes resigned.
With time running out, Van Susteren sent a letter to Fox last Thursday night, informing the network of her decision.
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