20 Years Later, Prince William Is Still In Shock Over Diana's Death

The younger members of the British royal family regularly use their platform to spread awareness surrounding mental health . While encouraging others to talk more openly, both Prince William and Prince Harry are also opening up about the death of their mother 20 years ago.

Will, Kate and Harry appear in the BBCs upcoming documentary Mind Over Marathon, which follows 10 people living with or affected by mental health conditions as they prepare to run the 2017 London Marathon on April 23.

While filming, William shared his ongoing feelings about the death of Princess Diana when talking to Rhian Burke , a runner who has suffered from PTSD since losing her one-year-old son followed by her husbands suicide over a five-day period in 2012. William revealed the shock of Dianas death has never gone away.

After losing her baby boy and husband in 2012 @rhian_burke spoke to Prince William as part of a new @bbcone documentary #MindOverMarathon pic.twitter.com/WqW6EmEpFy

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After losing her baby boy and husband in 2012 @rhian_burke spoke to Prince William as part of a new @bbcone documentary #MindOverMarathon pic.twitter.com/WqW6EmEpFy
BBC Breakfast (@BBCBreakfast) April 19, 2017

The shock is the biggest thing, he told Burke. And I still feel 20 years later about my mother, I still have shock within me 20 years later. People go, Shock cant last that long, but it does. You never get over it, its such an unbelievably big moment in your life that it never leaves you. You just learn to deal with it.

Burke expressed worry about her other children coping as they grow up, but William reassured her theyll be absolutely fine.

You try and understand your emotions a lot more than probably someone whos just lived life without any issues, he told her. And I think thats quite critical because you can start explaining to them what those emotions mean, why they feel like they do. Because once you start rationalizing a little bit and you understand Im really angry, Im really down, or Im really upset about something, then you can... relativize it and deal with it.

Earlier this week, Harry revealed he struggled with his emotions about his moms death for years before finally getting counseling at age 28.

Its brave for anyone to talk honestly about grief, but were especially encouraged to see people who reach as vast an audience as the royals normalizing this important part of the process. Check out the touching clip above.

Mind Over Marathon airs on BBC One Thursday.