It was as Tony Blair's Labour culture secretary in the early noughties that she championed the capital's eventually successful bid to host the games, in the face of Civil Service and Cabinet scepticism.
Jowell, who was 70, had brain cancer diagnosed in May previous year.
The Labour politician played a major role in securing the 2012 Olympics for London when she served as culture secretary.
In her powerful and moving speech in the House of Lords, she also backed our campaign for 5-ALA - the so-called "pink drink", which causes brain tumour cells to glow in the dark and therefore makes them more easily visible to surgeons operating to remove them - to be made available across the United Kingdom to any patient who would benefit from its use.
Hunt said he had been "moved by her bravery and selfless campaigning in her final months, and determined to honour her life and memory with the action on brain cancer that she fought so hard for".
Dame Tessa gave a moving speech in the House of Lords in January, in which she expressed her hope that "we can live well with cancer, not just die of it".
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'She died peacefully at the family home near Shipston-on-Stour in Warwickshire last night, shortly after 10pm.
Colleagues on the red benches also paid homage to her legacies, including her work in the House of Lords.
"Baroness Jowell was one of the key figures in the delivery of London 2012 and was a great friend to British Olympic sport". The following day - July 7, 2005 - four suicide bombers targeted the London transport network, killing 52 people and injuring hundreds more. "We were celebrating having won the Olympic bid when my private secretary received a call from London to be told that there might have been a terrorist attack on the Tube network".
Former acting leader of the Labour Party Harriet Harman, who lived in Dame Tessa's constituency and represents neighbouring seat Camberwell and Peckham, celebrated Dame Tessa's politics of "smiling not shouting". I was in Singapore.
"As the full scale of the atrocity became clear, those of us representing the U.K.in Singapore could think about just one thing".
Keith Chegwin, Emma Chambers, Seah Hughes and Petter Sallis were some of the other names remembered during the segment, who have all been lost within the previous year.
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"Despite going through all of that and wanting to spend precious time with her family... she gave up so much of that time to continue to campaign, to ask for change, because it really matters", she told the BBC.
"So it was a deeply civilized thing that we did in those marvelous two weeks in the summer of 2012".
He said: 'Tessa Jowell was an inspirational woman and committed parliamentarian.
More tributes to follow...
She is survived by her husband and children.
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