The mystery of what happened to a notorious aristocrat who disappeared 40 years ago is being brought to the small screen.

Actor Rory Kinnear will play Lord Lucan who vanished after his family’s nanny, Sandra Rivett, was found dead at the home of his estranged wife in London’s Belgravia in 1974 after being bludgeoned with a lead pipe.

The drama will also depict how the attacker then turned on Lady Lucan, beating her severely before she managed to escape and raise the alarm at a nearby pub.

Lord Lucan's car was later found abandoned and soaked in blood in Newhaven and an inquest jury declared the wealthy aristocrat the killer a year later.

What happened to Lucan remains a mystery and he was officially declared dead by the High Court in 1999, but there have been reported sightings of him as far afield as Australia, Ireland and South Africa.

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