On Aug. 21, 1997, less than 10 days before her death, Britain's Princess of Wales sprinted after an early-morning session at a gym in Earls Court, west London.
Diana, Princess of Wales, and Dodi Fayed, seen in this undated combination picture, had been dating during the summer of 1997, even taking a vacation with Diana's sons, Prince William and Prince Harry.
In this picture made from a security video, Diana is seen arriving at the Ritz Hotel in Paris Aug. 30, 1997. Just hours later, the princess, along with her boyfriend Dodi Fayed and their chauffeur, died from injuries sustained in a car crash in the early hours of Aug. 31.
In this picture made from a security video taken at the Ritz Hotel in Paris, Fayed puts his arm around Diana as they talk to their driver Henri Paul and bodyguard Trevor Rees-Jones. Not long after, the car driven by Paul crashes.
Police block access to the tunnel along the Seine river where Diana, Fayed and Paul were killed early Aug. 31, 1997. The car wreck is visible on the right side of the tunnel.
Again, the car is visible at right in the tunnel along the Seine river.
Workers prepare to remove the car wreck.
A closer look at the car.
A police white chalk mark points to the spot where Diana's car reportedly hit the sidewalk before crashing into the wall in this tunnel along the Seine River in Paris Aug. 31, 1997.
Henri Paul was the driver during the accident that left Princess Diana, her friend Dodi Fayed and himself dead. Paul's funeral took place Sept. 20, 1997, in Paul's hometown of Lorient, in Brittany, western France.
Princess Diana's bodyguard, Trevor Rees-Jones, the sole survivor of the crash.
Prince Charles leaves the Salpetriere hospital with Princess Diana's sisters, Lady Jane Fellowes, left, and Lady Sarah McCorquodale, after they came to collect Diana's body in Paris Aug. 31, 1997. French President Jacques Chirac and his wife, Bernadette, appear in second row.
Republican Guards stand at attention as pall bearers carry the Royal Standard-covered coffin of Diana, Princess of Wales, out of the Salpetriere hospital in Paris Aug. 31, 1997, after Prince Charles came to escort the body back Britain.
Visitors to New York's Times Square early Aug. 31, 1997, read the news on the "zipper" that Britain's Princess Diana died in Paris hours earlier.
The Union Jack flag flies at half-staff over the Houses of Parliament in London Aug. 31, 1997, following the death of Diana.
Prince Harry holds onto his father Prince Charles' hand when they stopped outside the gates to Balmoral Castle to look at the floral tributes Sept. 4, 1997. Prince William is seen leaning over on the right side of his father. Queen Elizabeth II, in black, is on the far right.
Mohammed Al Fayed holds his face, as he leaves London's Westminster Abbey with his wife, Heini, Sept. 6, 1997, following the funeral service for Diana, Princess of Wales. Al Fayed's son, Dodi, was killed along with the princess and their driver.
Earl Charles Spencer, Prince William, Prince Harry, and Prince Charles stand by the hearse as it pulls away from Westminster Abbey carrying the body Princess Diana after her funeral service in London, Sept. 6, 1997.
Floral tributes to Princess Diana lay outside London's Kensington Palace, the official London residence of the princess, on Sept. 2, 1997.
This is a Aug. 9, 1997, file photo of Diana and her butler, Paul Burrell, near Tuzla, Bosnia. Diana wrote in a letter months before her death that she feared someone was planning to kill her in a staged car accident, a London newspaper reported Oct. 20, 2003. In excerpts from a new book by Burrell, The Daily Mirror quoted Diana as writing that "this particular phase in my life is the most dangerous."