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Prince William Says He's Still In Shock Over Princess Diana's Death

04/19/2017 01:26 EDT

Nearly 20 years after Princess Diana died in a car crash, her eldest son, Prince William, says he still feels shock over it.

"I still have shock within me — people say it can't last that long but it does," Prince William said in a filmed interview for BBC One's "Mind Over Marathon" documentary. "The shock is the biggest thing [which] I still feel 20 years later, about my mother. You never get over it, it's such an unbelievably big moment in your life that it never leaves you. You just learn to deal with it."

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William, who was only 15 years old when his mother died, isn't the only one talking about his mother's death. Prince Harry also recently opened up about the effect the loss of his mum had on him, and even admitted to shutting down his emotions up until just a few short years ago when William suggested he speak with a therapist.

"My way of dealing with it was sticking my head in the sand, refusing to ever think about my mum, because why would that help?'' Harry said of his teens and early twenties.

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The brothers, alongside the Duchess of Cambridge, are on a mission to get people talking about mental health. The trio founded Heads Together, a charity campaign focused on dispelling the stigma surrounding mental health.

The campaign was named the 2017 Virgin Money London Marathon Charity of the Year and will be highlighted throughout the marathon on April 23.

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