Megyn Kelly announced today she is leaving Fox News Channel, moving to NBC News.

"After more than a dozen years at Fox News, I have decided to pursue a new challenge," Kelly said on "The Kelly File", thanking her crew, colleagues and viewers for their support.

"I'll be leaving Fox News at the week's end and starting a new adventure," she said.

Earlier Tuesday, Kelly made her official announcement on Facebook:

"While I will greatly miss my colleagues at Fox, I am delighted to be joining the NBC News family and taking on a new challenge. I remain deeply grateful to Fox News, to Rupert, Lachlan and James Murdoch, and especially to all of the FNC viewers, who have taught me so much about what really matters."

Kelly joined Fox News Channel in 2004 and has hosted "The Kelly File" on weeknights from 9pm to 10pm ET since Oct. 2013.

Howard Kurtz reported the news on "Happening Now," noting that Kelly's contract was due to expire later this year.

He explained that Kelly was known to be pursuing a role which would allow her to spend more time with her three children.

UPDATE, 4:00pm ET: Rupert Murdoch, Executive Chairman of 21st Century Fox and Executive Chairman of FOX News Channel & FOX Business Network, released the following statement: "We thank Megyn Kelly for her 12 years of contributions to FOX News. We hope she enjoys tremendous success in her career and wish her and her family all the best."

Kelly's last day on the air will be on Friday, January 6th.

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