The 25th anniversary of Princess Diana's death will be "traumatic" for her sons Prince William and Prince Harry, a royal expert has claimed. Wednesday marks quarter of a century since Diana, her partner Dodi Fayed, and the driver of their car Henri Paul died following a crash in the Pont de l'Alma tunnel in Paris. Although the anniversary will be tough for her two sons every year, Jennie Bond notes how heightened interest around the event will be "particularly difficult" for them to deal with due to the significance of it being 25 years.