Megyn Kelly, who arrived at Fox News 12 years ago as a television news neophyte but rose to become one of its two biggest stars, has decided to leave the network to take on a broad new role at NBC News for an undisclosed amount, people briefed on the negotiations said on Tuesday.
The NBC News chairman, Andrew Lack, wooed Ms. Kelly away from Fox News by offering her a triple role in which she will host her own daytime news and discussion program, anchor an in-depth Sunday night news show and take regular part in the networks special political programming and other big-event coverage.
The move will herald a seismic shift in the cable news landscape, where Ms. Kelly had become the second-most watched host after Bill OReilly of Fox News and often helped define the national political debate, especially over the last year as Donald J. Trump regularly attacked her, at times in viciously personal terms.
Ms. Kellys departure would upend Fox Newss vaunted prime-time lineup and inject a new dose of tumult just a few months after the departure of the networks powerful founding chairman, Roger Ailes, who was ousted after several women made allegations that he sexually harassed them.
