Prince Harry opened up about mourning the loss of his mother, Princess Diana , days before the 25th anniversary of her death.

The Princess of Wales died on Aug. 31, 1997, after a car crash in Paris. She was 36 at the time, while Harry was just 12 and Prince William was 15.

Next week is the 25th anniversary of my mothers death, and she most certainly will never be forgotten, the Duke of Sussex said Thursday at an event for the charity Sentebale in Aspen, Colorado.

I want it to be a day filled with memories of her incredible work and love for the way that she did it, the prince added. I want it to be a day to share the spirit of my mum with my family, with my children who I wish could have met her. Every day, I hope to do her proud.