Former Labour chief whip Derek Foster has died aged 81.
The Labour whips office said Lord Foster died in hospital in Sunderland of secondary cancer.
He was an MP from 1979 to 2005 before becoming Lord Foster of Bishop Auckland - the seat he had represented in the Commons.
Labour leader Jeremy Corbyn said Lord Foster, who was opposition chief whip from 1985 to 1995, had "served our party with distinction".
Mr Corbyn, a serial rebel while a backbencher, said:
As chief whip, he was always kind to me and supportive of new MPs.
Lord Foster became the first ministerial resignation suffered by Tony Blair's government - just two days after being appointed in May 1997 - reportedly in protest at the junior role he had been given at the Cabinet Office.
Nick Brown, Labour's current chief whip, said:
As a Member of Parliament for Bishop Auckland, Derek Foster was the longest serving chief whip to theParliamentary Labour Party in modern times, serving for 10 years. His shrewd judgment and fair-mindedness won the respect of his colleagues.