The Sunday Mirror's political editor Vincent Moss has left his position after nine years.
Moss started his journalism career at the Bristol Evening Post and started in the Lobby in 1995 as political editor for agency Central Press.
He went on to work for The Mail on Sunday as a political correspondent and freelanced before joining the Sunday Mirror.
Last year, Moss worked alongside reporter Matthew Drake and Guido Fawkes on the Brooks Newmark MP 'sexting' sting.
In 2010, he obtained a leaked copy of the Queen's Speech. At the time, he told Press Gazette: "No money changed hands, it was just a good old-fashioned scoop relying on contacts, built up in my case over the last 15 years. Details have leaked from previous Queen's Speeches, but never the full details before and significantly – never the words of the Queen."
Press Gazette understands Moss will continue to write about politics, with a book project planned, but will also be working in business.
The news comes shortly after Daily Mirror executive features editor Shiraz Lalani announced his departure.
Announcing his leaving on Twitter, Lalani said: "So, just left the Mirror. Where did that 18 years go?"
Over the summer, Press Gazette also reported on the departures of reporter/night news editor Don Mackay, south of England reporter Euan Stretch, news reporter Adrian Shaw and feature writer Alun Palmer.
Moss was praised by colleagues after announcing his departure this morning.
Political commentator Dan Hodges said: "Loss of @vincentmoss sad day for the Sunday Mirror. Not sure the Mirror titles have worked out how to cover Corbynism."
Shadow culture secretary Michael Dugher MP said: "All the best @vincentmoss – a big loss to the Mirror, one of the last of the great pro's in political journalism & a very fine man indeed."
The Mail on Sunday's Tim Walker said: "Sometimes it seems like an oxymoron, but I salute a real gentleman journalist – and a formidable scoop merchant!"
Meanwhile, Paul Routledge has been redundant from the Daily Mirror after 17 years as a weekly columnist, but he will be continuing to write for the paper on a freelance basis.