Labour MP Charles Chauvel has announced his resignation from Parliament.
He will take up a position with the United Nations in New York.
His new role is as an adviser on Parliamentary Development and Democratic Governance.
His resignation is effective from March 11.
He is a list MP, meaning Carol Beaumont is next in line to enter Parliament.
Labour Leader David Shearer said he had accepted Chauvel's resignation.
"Charles is a talented and dedicated MP who has made a huge contribution to the Labour team. He will be missed," he said.
"We thank him for his commitment to standing up for New Zealanders and for working to make people's lives better.
''Charles has played an important role within the Labour team. He has chaired a number of select committees and represented Labour in many portfolio areas since 2006, including most recently as shadow attorney-general and spokesperson for Justice and Arts, Culture and Heritage.
"We wish Charles well with his new role. He will do New Zealand proud in this international assignment," Shearer said.
This clears the way for former Labour List MP Carol Beaumont to make a return to Parliament. Ms Beaumont failed to regain the Maungakiekie seat from National MP Sam Lotu-Iiga in2008 at the 2011 election, and was too far down the list to survive the purge when Labour sunk to its lowest-ever MMP vote.
It will be interesting to see what effect Mr Chauvel's resignation has on the dynamics of the Labour caucus. One of Labour's Davids is likely to be happier than the other. But one thing is for sure; the New York Branch of the Labour Party is about to grow in number!
Whilst we might be poles apart from Mr Chauvel politically, he has done a job that we wouldn't even contemplate doing, irrespective of how well it paid. We wish him well.