Tony Blair has led the tributes to Labour MP Paul Daisley who has died of cancer aged 45.
Mr Daisley had been an MP for just two years
The prime minister said he believed that but for his untimely death, Mr Daisley would have gone on to achieve a "great deal" as a politician.
In December, colleagues at the House of Commons were told the MP only had a short time to live.
Mr Daisley, the member for Brent East in London, won the seat at the June 2001 general election.
His maiden speech was delayed while he spent seven months in hospital being treated for cancer of the colon.
Mr Daisley, a former leader of Brent Council in north London, had taken over the seat from Ken Livingstone, now Mayor of London.
Paying tribute Mr Blair said: "He had only a short time as an MP and could, I am sure, have gone on to have
achieved a great deal in politics."
Labour general secretary David Triesman said: "Our thoughts are today with Paul's wife Lesley and his family.
"Paul was an accomplished politician, with a promising political career.
"Paul had been battling cancer with great bravery for some time.
"Throughout his illness, he continued to work tirelessly on behalf of his constituents.
"This is a great loss. Paul will be greatly missed by everyone who knew him across the Labour Party and across his constituency."
Mr Triesman added that during his brief time in Parliament, Mr Daisley had "established a reputation as an active and dedicated MP".
Party chairman Ian McCartney also expressed "great sadness" at the news of Mr Daisley's death.
"Paul was a strong champion for the people of Brent as leader of its council
and a dedicated servant of the Labour Party," he said.
"His fight against cancer was typified by the brave maiden speech he made
"To lose someone of Paul's potential so young is a tragedy.
"The party has lost one of its own today and our thoughts go out to Lesley and all his family."
And the chief executive of Colon Cancer Concern, Jola Gore-Booth, said Mr Daisley was "an example to everyone" in the way he fought bowel cancer.
"He achieved a great deal in raising awareness of the disease and empowering others affected by it. He will be sorely missed," she said.
"On behalf of Colon Cancer Concern, may I add our condolences to Paul Daisley MP's family at this very sad time."