** 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 urged Muslim followers to "cut the tongue" of the late-night host because of a joke Letterman had made about al Qaeda leaders. (AP Photo/CBS, Heather Wines)
In this undated TV image originally released by CBS, Vivian Vance, left, and Lucille Ball are shown in a scene from the comedy series, "I Love Lucy." Ball, who died on April 26, 1989, would have celebrated her 100th birthday on Saturday, Aug. 6, 2011. (AP Photo/CBS, file)
Associated Press photographs
Marion Ross and the now-deceased Tom Bosley, seen here in December 2004, were co-stars for 10 years on TV's “Happy Days.” She and his widow, along with other cast members, are suing CBS for more royalties from sales of “Happy Days”-themed merchandise.
The cast of "Big Brother 13" consists of eight new guests and a few power duos from previous seasons. The new chapter of the voyeuristic reality TV series, titled "Double Trouble," premieres Thursday on CBS.
Former House Speaker Newt Gingrich, who is running for the Republican presidential nomination, appears on CBS' "Face the Nation" on Sunday, May 22, 2011, in Washington. (AP Photo/CBS News, Chris Usher)
In this image taken from video and released by CBS, President Obama is seen during a May 4 interview with “60 Minutes” correspondent Steve Kroft at the White House. During the interview, Obama told Kroft that he decided not to release the photos taken of Osama Bin Laden after he was killed by Navy SEALS in Pakistan. (Associated Press/CBS)
In this image taken from video and released by CBS, President Barack Obama is seen during an interview with “60 Minutes” correspondent Steve Kroft at the White House in Washington, Wednesday, May 4, 2011. During the interview, Obama told Kroft that he decided not to release the photos taken of Osama Bin Laden after he was killed by Navy SEALS in Pakistan. (AP Photos/CBS)
CBS via associated press
President Obama, in an interview with "60 Minutes" correspondent Steve Kroft, said he would not authorize the release of photos taken of Osama bin Laden after he was killed by Navy SEALS. His administration does, however, want to analyze materials seized by Pakistani authorities at bin Laden's compound.
**FILE** "60 Minutes" correspondent Scott Pelley is seen here in a 2005 photo released by CBS. CBS announced Tuesday that Pelley, the veteran "60 Minutes" reporter, will take over as its evening news anchor, starting on June 6, to replace Katie Couric on the "CBS Evening News." (Associated Press/CBS, John Filo)
Sen. Jeff Sessions, ranking Republican on the Senate Budget Committee, discusses last week's budget deal and the debt ceiling on CBS' "Face the Nation" on Sunday. He said President Obama must do more than just give a speech he is planning this week. (Associated Press)
Katie Couric, who reportedly is leaving her anchor post at "CBS Evening News," is expected to launch a syndicated talk show in 2012. Mrs. Couric was the first woman to solely helm a network TV evening newscast. (Associated Press)
Senate Majority Leader Harry Reid, Nevada Democrat, talks about the possibility of a government shutdown over a budget impasse and U.S. military action in Libya on CBS' "Face the Nation" in Washington on Sunday, April 3, 2011. (AP Photo/CBS, Chris Usher)
Secretary of Defense Robert M. Gates and Secretary of State Hillary Rodham Clinton discuss the latest developments in the Middle East during a pre-taped interview that aired on Sunday, March 27, 2011, on CBS' "Face the Nation." Mr. Gates said he doesn't think that Libya is "a vital interest" for the United States but that the North African nation is part of a region that is of vital American interest. (AP Photo/CBS, Chris Usher)
In this undated publicity image released by CBS, from left, Jason Segel, Alyson Hannigan, Neil Patrick Harris, and Josh Radnor are shown in a scene from "How I Met Your Mother." (AP Photo/CBS, Ron P. Jaffe)
In this undated publicity image released by CBS, from left, Charlie Sheen, Angus T. Jones and Conchata Ferrell are shown during the taping of "Two and a Half Men," in Los Angeles. (AP Photo/CBS, Greg Gayne)