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She was just 36 at the time, with her death triggering an unprecedented outpouring of grief across Britain.
She died along with Dodi Fayed, her wealthy Egyptian boyfriend of two months, and his driver Henri Paul who was trying to shake off paparazzi photographers.
Two decades on, Britain has still not forgotten.
“20 years ago today, the world lost an angel,” pop star Elton John, a friend of Diana’s who worked with her to raise awareness about AIDS, said on Instagram next to a picture of the two of them.
Well wishers laid flowers and candles outside Kensington Palace, her London residence where her sons Princes William and Harry now live.
A couple in Union Jack clothing were the first to arrive on Thursday morning at the palace gates and hundreds filed past during the day.
“I don’t think there’s anyone else like her now, she was a one off… She was electric, she was just dynamite,” said Ian, a receptionist from Hertfordshire, north of London, and one of those who came to pay their respects.
Overnight, a handful of people had braved the rain in Paris to visit the Pont de l’Alma tunnel where her car smashed into a pillar at 12:23 am on August 31, 1997, ending the life of the world’s most famous woman.
Diana was “revolutionary,” said Sian Croston, a 17-year-old student from London who was visiting the gold-leaf Flame of Liberty monument that stands above the underpass and has become something of a shrine to the princess.
“She changed the royal family forever.
“She will always be the people’s princess,” she said, using an epithet coined at the time by prime minister Tony Blair.
Linda Bigelbach, a 61-year-old US tourist from Minnesota, recalled: “I remember her wedding day and I remember the day she died.”
– ‘All of us lost somebody’ –
In London, William and Harry, who were 15 and 12 respectively when she died, were spending the day privately after greeting well-wishers outside the palace on Wednesday.
Earlier in the day, they had walked through the White Garden, a space within the palace grounds created this year to evoke memories of Diana’s image and style.
They also met with representatives of the charities she supported, including those helping AIDS sufferers and children in need.
Speaking to one group, Harry said his mother’s death had affected everyone.
“All of us lost somebody,” the 32-year-old said.
The flowers piled up in front of the palace alongside heartfelt handwritten messages and photos remembering Diana, with the two brothers placing bouquets handed to them by several members of the public.
“I was so sad,” recalled a tearful Lena Pettersson, a cleaner who had travelled from Sweden to pay her respects.
“She cared about people, she was very special. Her sons are continuing her work, they are just like her.”
Virgin founder Richard Branson, a friend, said Diana was an “incredible woman” whose “unique way with people” made a huge difference to the causes she championed.
“She inspired so many others with her compassion and humanity,” he said.
– Global icon –
Diana was to be remembered on Thursday at the Mildmay Mission AIDS hospital in London, which was visited regularly by the princess when it was a hospice caring for HIV patients.
There, staff members both past and present will attend a remembrance service with those who knew her sharing their memories.
Her untimely death shocked the world.
The complex life of Diana — a shy, teenage aristocrat who suddenly became a global icon — and her tragic end, still captivates millions across the globe.
Diana married Prince Charles, the heir to the throne, in 1981, but their marriage collapsed under the strains of public duty and their incompatibility.
She was cast out of the royal family after their 1996 divorce which she had made inevitable with an explosive tell-all television interview.
But among the public, her star remained undimmed, with her reputation sealed as a fashion icon, charity campaigner, humanitarian and a self-styled “queen of hearts”.
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