Princess Diana was killed in a tragic car accident on August 31, 1997, and before she was laid to rest at her family's Althorp estate, the royal was honored at a funeral attended by 2,000 guests.

Princess Margaret attended Princess Diana’s funeral with her son Lord Linley and his wife Lady Serena Linley. Margaret later passed away from a stroke in 2002, less than five years later.

From left, Charles Spencer, Prince William, Prince Harry and Prince Charles are pictured at Princess Diana's funeral on September 6, 1997. Harry wrote about the day in his 2023 memoir.

The U.K.'s award-winning Rock Choir is harmonizing for the 25th anniversary of The Diana Award established in memory of Princess Diana by releasing a special new charity song.