It's been almost 50 years since the notorious Lord Lucan murder mystery shocked the world.

On November 7, 1974, children's nanny Sandra Rivett, 29, was bludgeoned to death while working for the Lucan family in their London townhouse. Her body was found in a blood-soaked mailbag in the basement kitchen, but the prime murder suspect, her boss Richard John Bingham, had already fled the country.