Lord Lucan raced powerboats through the English Channel, drove an Aston Martin around the Grand Canyon and completed the Cresta Run at Saint-Moritz.
Throwing himself into gambling, he was nicknamed Lucky.
With slicked back hair, charm, style and humour, he was remarkably striking.
But underneath this image there was a very different man.
Alex hears from friends, biographers and someone who lived in the Lucan household to ask who really was Lord Lucan?
Was he the vicious, violent and dangerous murderer of Sandra Rivett or was this a myth it was seductive to believe?
Producer: Sarah Bowen