Diana's body guard Ken Wharfe tried to warn her off from former lover James Hewitt

Diana hands a trophy to James Hewitt at a sporting event.

Princess Diane's former body guard, Ken Wharfe, tried to shield the Princess of Wales away from James Hewitt, who was called a liar and a cad by The Mail on Sunday.

"Diana was a prolific letter writer," says Wharfe, who guarded the princess for seven years from 1987. "I told her repeatedly, as did other close friends of hers, that those letters to Hewitt were hostages to fortune, and in her position she had to be careful."

Here's the full story at Mail Online, which details how Wharfe tried to protect Diana from James Hewitt.