The peer has been 'spotted' at an ex-Nazi colony in Paraguay, a sheep station in the Australian outback and backpacking on Mount Etna - and that's just the start
Lord Lucan was finally been given a death certificate 42 years after he went missing and became Britain's most notorious murder suspect.
Now, as his reclusive wife, Lady Veronica Lucan, gives her first TV interview more of the bizarre theories of what happened to the world's most mysterious men have surfaced.
Lord Lucan vanished without trace in 1974 after the murder of his children’s nanny Sandra Rivett, who died after being hit with a lead pipe in the basement of the family home in Belgravia, central London.
It is suspected Lucan killed his nanny when he mistook her for his wife on the night of the murder.
Lady Lucan was herself badly injured in the attack and named her husband as the man who attacked her and killed Sandra Rivett.
Theories: Lord Lucan with his wife Veronica before his disappearance
The police named the peer as the prime suspect, but could only find a blood-stained car he was seen driving, abandoned at Newhaven, east Sussex.
There have been reported sightings in Australia, Ireland, South Africa and New Zealand, and even claims that he fled to India and lived life as a hippy.
Here are just some of the conspiracy theories surrounding his disappearance:
Lucan lived as a hippy in India called 'Jungle Barry'
Former Scotland Yard detective Duncan MacLaughlin claimed in 2003 that Lord Lucan had lived as a hippy in India until his death in 1996.
He claimed Lord Lucan had lived under the name Barry Halpin and was known as Jungle Barry.
'Sighting': Barry Halpin pictured in India (Image: Rex)
A photograph claiming to show a bearded, dishevelled Lucan in 1991 also bared a strong resemblance to the missing peer.
It eventually emerged Halpin was very real - but that he was from St Helens and a well-known figure on the Merseyside folk music scene of the 1960s.
He lived in the New Zealand outback with a goat called Camilla
Local residents deep in the New Zealand outback claimed in 2007 that a British ex-pat Roger Woodgate could be Lord Lucan.
He was said to have an upper-class English accent and a strong resemblance to the fugitive peer - as well as a pet possum and a goat called Camilla.
Mystery: Lord lucan with daughter in Mediterranean 1973, shortly before his disappearance
Mr Woodgate has continually denied the claims ever since and points out that he is five inches shorter and 10 years younger than Lord Lucan.
'Captured by police'... but turned out to be Labour MP who faked his own death
Australian Police swooped just months after Lord Lucan's disappearance and arrested a man they announced they believed was the missing peer.
But the arrest took a more incredible twist when it emerged they'd actually found 'dead' Labour MP John Stonehouse alive and well.
Back in Blighty: John Stonehouse, left, accompanied by Scotland Yard's DCS Ken Etheridge on his return to England (Image: Mirrorpix)
Stonehouse had faked his own drowning off the coast of Miami earlier that year because of financial problems.
He was deported back to the UK and the search for Lord Lucan continued.
And other bizarre one-off sightings...
A number of people have reported seeing Lord Lucan in a range of bizarre locations and scenarios.
Such sightings include on an ex-Nazi colony in Paraguay, at a sheep station in the Australian outback, backpacking on Mount Etna and working as a waiter in San Francisco.
One couple also reported seeing him in a private hospital in Johannesburg in 1995.
He was fed to tigers after shooting himself
Just last week, Philippe Marcq - who was part of the same gambling set as the notorious peer - says one of Lord Lucan's best friends confirmed the gruesome story to him 40 years ago.
'Fed to the tigers': John Aspinall with tigers at Howletts Zoo July 1971
He claims the peer was given a shotgun to shoot himself before his body was fed to a tiger owned by friend John Aspinall at his private zoo in Kent.
He told the Daily Mail: "I was stunned when Stephen told me this, absolutely stunned.
"But I believed what he told me 100 per cent. He was telling me very seriously and him telling me was a sign of considerable trust.
"I felt sworn to secrecy. It was a secret I could not betray — and, until now, I have not."