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Theory rival spy 'trained in the dark arts of the secret services' murdered British agent Mystery of second mobile phone containing video of victim dancing naked in nothing but cowboy boots

By Daniel Miller

PUBLISHED: 05:54 EST, 6 May 2012 | UPDATED: 02:16 EST, 7 May 2012

Murdered by a foreign agent? MI6 codebreaker Gareth Williams

Detectives investigating the mysterious death of the body-in-the-bag spy believe a killer could have slipped back into his flat through a skylight to cover his tracks, it has been claimed.

MI6 codebreaker Gareth Williams was found dead in his London flat in 2010. A coroner ruled that he was 'probably killed illegally and his family remain convinced he was the victim of a rival agent.

Many close to the case believe he was assassinated by a spy working for foreign powers because of his work for MI6 and the US National Security Agency.

Speculation over the exact nature of his work has been growing since Foreign Secretary William Hague signed a public interest in order to stop details being released on security grounds.

It has been claimed that MI6 and the government eavesdropping centre GCHQ, to which Williams was attached, have been working on a computer virus designed to disrupt Iran's nuclear programme.

Questions are also being asked as to how MI6 came into possession of a second iPhone belonging to Mr Williams when Police found only one at his flat.

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Did spy-in-bag killer slip back into the flat through skylight to cover his tracks? New theory emerges over MI6 ...