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Late Show with David Letterman
Brian Williams cancels his Letterman appearance
Brian Williams cancels his Letterman appearance

Embattled NBC Nightly News anchor Brian Williams has pulled out of his scheduled Thursday appearance on "Late Show With David Letterman." Williams did not feel he should keep his commitment to be a guest on the program when no determination has been made as to when he will return to NBC Nightly News, according to an NBC News executive not authorized to discuss the matter publicly. Since no date for his return has been set, Williams wanted "Late Show" to have adequate notice to book another guest, the executive added. RELATED: Brian Williams misremembers -- and the Internet won't let him forget it Williams announced Saturday that he was taking a short...