FILE - In this April 21, 2010 file photo released by CBS, host David Letterman is shown on the set of the "Late Show with David Letterman, in New York. Letterman is back at "Late Show" Monday, Aug. 22, 2011, after a two-week vacation, his first day at work since a threat against his life was posted on a website. Last week, a frequent contributor to a jihadist website posted a threat to Letterman. He urged Muslim followers to "cut the tongue" of the late-night host because of a joke the comic had made about al-Qaida leaders on his CBS show. (AP Photo/CBS, Heather Wines) MANDATORY CREDIT; NO SALES; NO ARCHIVE; NORTH AMERICAN USE ONLY

Associated Press
FILE - In this April 21, 2010 file photo released by CBS, host David Letterman is shown on the set of the "Late Show with David Letterman, in New York. Letterman is back at "Late Show" Monday, Aug. 22, 2011, after a two-week vacation, his first day at work since a threat against his life was posted on a website. Last week, a frequent contributor to a jihadist website posted a threat to Letterman. He urged Muslim followers to "cut the tongue" of the late-night host because of a joke the comic had made about al-Qaida leaders on his CBS show. (AP Photo/CBS, Heather Wines) MANDATORY CREDIT; NO SALES; NO ARCHIVE; NORTH AMERICAN USE ONLY
FILE - In this April 21, 2010 file photo released by CBS, host David Letterman is shown on the set of the "Late Show with David Letterman, in New York. Letterman is back at "Late Show" Monday, Aug. 22, 2011, after a two-week vacation, his first day at work since a threat against his life was posted on a website. Last week, a frequent contributor to a jihadist website posted a threat to Letterman. He urged Muslim followers to "cut the tongue" of the late-night host because of a joke the comic had made about al-Qaida leaders on his CBS show. (AP Photo/CBS, Heather Wines) MANDATORY CREDIT; NO SALES; NO ARCHIVE; NORTH AMERICAN USE ONLY
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