Wikipedia: Richard John Bingham, 7th Earl of Lucan
On the evening of November 7th 1974, the 7th Earl of Lucan, an inveterate gambler and Backgammon champion with a taste for power boats, snuck into his estranged wife’s basement. He then bludgeoned their nanny with a lead pipe and placed her in a canvas sack, before attempting to murder his wife. Recognizing his voice, she convinced him that she could him escape, then slipped out a bathroom window. Lord Lucan was never seen again.
