British lawmaker David Miliband, who lost the 2010 battle for the leadership of the opposition Labour party to his younger brother Ed, is to stand down as an MP, it was reported on Monday.
David Miliband, who was foreign secretary in Gordon Brown's government, quit front-line politics after his bruising defeat.
He will now leave his post as representative for the northern England seat of South Shields, which he has occupied since 2001, the Daily Mirror reported.
He is set to take up a "big international job" in New York within the charity sector, friends told the BBC.
The two brothers have publicly denied falling out over the leadership vote, but David has missed his younger brother's last two speeches at the Labour Party's annual conference.
The siblings are the sons of Marxist theorist Ralph Miliband.