Kai Eide said he always intended to leave after two years
The United Nations envoy to Afghanistan, Kai Eide, will not continue in his role once his term expires in March, the UN says.
A UN spokesman told the BBC he never intended to stay beyond two years, and that a replacement was being sought.
Mr Eide asked the UN to start looking for a replacement now to ensure a smooth transition.
He had recently been criticised over his handling of the October elections which were marred by fraud allegations.
Mr Eide said he has always made it clear he had no intention of staying longer than his two-year contract.