Alastair Stewart is stepping down from his presenting duties at ITV following "errors of judgement" in his use of social media.
The 67-year-old has been a well-known face of the broadcaster with more than 40 years of experience as a newsreader.
It's currently not clear what the mistake posted to social media was, and his Twitter account appears to have been deleted.
The News at Ten presenter in a statement said: "It was a misjudgement which I regret, but it's been a privilege to bring the news to households throughout the UK for the past 40 years."
Michael Jermey, director of news and current affairs at ITV, said: "Alastair has been a long-standing, familiar figure to viewers of ITV News, both reporting and presenting with distinction. We wish him the very best for the future."
ITN's chief executive Anna Mallett added: "We would like to recognise Alastair's contribution as one of the UK's foremost journalists and TV presenters and to thank him for his commitment to delivering high-quality broadcast news over many years."
Stewart joined Southern Television in 1976 before joining ITN in 1980.
He served three years with Channel 4 News and then went on to become a main newsreader with ITV news.
