Back in 1974, 29-year-old Sandra Rivett was brutally murdered in a London basement. Her killer was never arrested but was widely believed to be well-known British aristocrat Richard John Bingham, also known as Lord Lucan.

Lord Lucan disappeared after the alleged murder of Ms. Rivett, who worked as his family’s nanny. Despite there being apparent sightings of him all over the world, he has never been found or put on trial.

However, photos of an Australian pensioner are now being described as a “definite match” for the alleged killer. Leading computer scientist Professor Hassan Ugail used an ­AI algorithm to run 4,000 cross-checks of seven photos – four of Lucan and three of the man in Australia, according to an exclusive by The Mirror. However, the paper has blurred the pensioner’s image, for legal reasons.

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Here’s what you need to know about Lord Lucan and whether the man in Australia could be the solution to his mystery.

Read more: Evening Standard