In their first American television interview, Princes William and Harry open up about losing their mother, Princess Diana, as the tenth anniversary of her death approaches in August.

"Over the last ten years I personally feel as though she's always there," Harry, 22, tells Matt Lauer in the interview scheduled to air on the Today show and Dateline NBC Monday.

Adds Prince William, 24, of his mother's death: "After it happened we were always thinking about it. ...There's not a day goes by I don't think about it."

In fact, Harry says he'll never stop wondering what exactly happened to his mother on that fateful August night in Paris when the car she was riding in crashed. "Whatever happened in that tunnel, you know no one will ever know," he tells Lauer. "And I'm sure people will always think about that... I'll never stop wondering about that.'

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