Roger Ailes, the television impresario who built Fox News into a financial and ratings juggernaut, will leave the network he spent 20 years building under a cloud of sexual harassment accusations.

The announcement that Ailes is resigning came Thursday (July 21) from 21st Century Fox, the network’s corporate parent, after weeks of uncertainly about Ailes future at the company. The announcement said he’ll step down immediately, with Rupert Murdoch assuming the role of chairman and acting CEO of Fox News Channel and Fox Business Network.

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