One of America's most influential news presenters, Dan Rather, has announced that he is to give up his role as the face of CBS News early next year.
Dan Rather has worked at CBS News for more than 40 years
The 73-year-old has presented the US network's main evening news broadcast for almost a quarter of a century.
He has faced criticism over a recent report questioning President George W Bush's military service, based on evidence which turned out to be forged.
Mr Rather has said he will continue to work as a correspondent for CBS.
"I have been lucky and
blessed over these years to have what is, to me, the best job
in the world and to have it at CBS News," he said on Tuesday.
The award-winning journalist has worked at CBS News for more than 40 years and made his name as a reporter covering President Richard Nixon's White House.
"He has been an eyewitness to the most important events
... and played a crucial role in keeping
the American public informed about those events and their
larger significance," CBS Chairman Leslie Moonves said.
RATHER BIG STORIES
1963: The death of President John F Kennedy
1970s: 'Watergate' scandal leading to President Richard Nixon's downfall
2001: Live anchoring of CBS News coverage of 9/11
2001: Reports from Afghanistan on US efforts to oust the Taleban
2003: An exclusive interview with Saddam Hussein in Baghdad
Mr Rather came into conflict with the Bush administration in the run-up to the US election over a documentary suggesting that the president had not fulfilled his National Guard service during the Vietnam war.
Correspondents say the incident gave ammunition to his conservative critics, who have long accused him of a liberal bias.
He made no mention of the National Guard story in
announcing the change, although he acknowledged the controversial report had become a "hippopotamus in the bathtub".
Mr Rather's move comes just before longtime rival Tom Brokaw
retires from NBC Nightly News in December.
It leaves Peter Jennings of ABC's World News Tonight as the last of the
triumvirate who ruled network news for more than 20 years.