A bizarre conspiracy theory claims that Elvis Presley faked his own death in order to participate in a secret FBI operation.
The King was said to be fearing for his life after attempting to bring down a criminal organisation named The Fraternity, the Daily Star reports.
He was found dead in the bathroom of his Graceland home on August 16, 1977 - although fans of the rock'n'roll legend have long maintained he is still alive.
A documentary exploring the theory has recently re-appeared on YouTube, with host Bill Bixby claiming to have FBI documents relating to Operation Fountain Pen.
FBI investigators are said to have enlisted Elvis in the battle against the deadly crime syndicate.
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And documentary The Elvis Files, filmed in 1990, also features a man named Luc Dionne, who claims to have worked for the Canadian government.
Mr Dionne claimed documents from the years between 1976 and 1982 contain Elvis' handwriting.
He said: "We can find numerous notation and correction in what I believe is Elvis’ handwriting.
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“I’m almost positive that Elvis Presley continued his involvement in Operation Fountain Pen for several years after his alleged death.”
Another person buying into the unlikely theory is handwriting expert Paul Weast, who said: “This handwriting was compared to known handwriting of Elvis Presley and it matches very, very closely."
