Boris Johnson has described Captain Sir Tom Moore as a "beacon of hope" following his death aged 100.
The charity fundraiser was taken to Bedford Hospital on Sunday after being treated for pneumonia for some time and testing positive for coronavirus last week.
In a statement, his daughters Hannah and Lucy said: "It is with great sadness that we announce the death of our dear father, Captain Sir Tom Moore.
"We are so grateful that we were with him during the last hours of his life; Hannah, Benjie and Georgia by his bedside and Lucy on FaceTime. We spent hours chatting to him, reminiscing about our childhood and our wonderful mother. We shared laughter and tears together.
"The last year of our father's life was nothing short of remarkable. He was rejuvenated and experienced things he'd only ever dreamed of."
Sir Tom's fundraising efforts raised more than £32 million for the NHS, walking 100 laps of his garden before his 100th birthday during the first national lockdown in April.
In a statement, Prime Minister Boris Johnson said: "Captain Sir Tom Moore was a hero in the truest sense of the word. In the dark days of the Second World War he fought for freedom and in the face of this country's deepest post war crisis he united us all, he cheered us all up, and he embodied the triumph of the human spirit.
"It is quite astonishing that at the age of 100 he raised more than £32 million for the NHS, and so gave countless others their own chance to thank the extraordinary men and women who have protected us through the pandemic.
"He became not just a national inspiration but a beacon of hope for the world. Our thoughts are with his daughter Hannah and all his family."
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The flag above 10 Downing Street will fly at half-mast following the death of Captain Sir Tom Moore.
Boris Johnson has spoken to Sir Tom's daughter Hannah Ingram-Moore to offer his condolences.
A Buckingham Palace spokesperson also said: "The Queen is sending a private message of condolence to the family of Captain Sir Tom Moore. Her Majesty very much enjoyed meeting Cpt Sir Tom and his family at Windsor last year.
"Her thoughts, and those of the Royal Family, are with them, recognising the inspiration he provided for the whole nation and others across the world."
