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MI6 spy Gareth Williams, who was found dead in a holdall, hacked into restricted information about former US President Bill Clinton, it has been claimed.

The 31-year-old from Valley, near Holyhead on Anglesey, was discovered inside a padlocked bag in a bath at his London home in 2010 and his death remains a mystery.

Theories surrounding his death include speculation that he was killed by fellow agents or suffocated during a sex game that went wrong.

Now it has been claimed that he illegally obtained a guest list for an event attended by Mr Clinton as a favour for a friend who was going.

'Diplomatic nightmare'

A source told the Sun on Sunday: “The Clinton diary hack came at a time when Williams’ work with America was of the most sensitive nature.

“It was a diplomatic nightmare for Sir John Sawers, the new director of MI6 at the time.”

More: MI6 spy Gareth Williams 'killed by agents who then broke into his flat to destroy evidence'

In 2013, following a three-year investigation, the Metropolitan Police concluded he had locked himself inside the red holdall and no one else was involved.

In contrast, a coroner ruled that Mr Williams had been killed unlawfully.

'Evidence moved'

Last week it was claimed that unknown secret service agents could have broken into his London flat through a skylight to clean evidence from the crime scene.

A source close to the investigation said forensic officers noticed equipment left in the Pimlico flat had been moved, despite the property being under armed guard.

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The source claimed special footplates, which allow officers to walk across the crime scene without contaminating evidence, appeared to have been moved on the first day of the investigation.

Detectives suggested that someone had scaled the walls of the building and climbed in through the skylight to get access to evidence left behind.

It supports Mr Williams’ family’s theory that he was murdered by secret service agents.

'Unlawful killing' - coroner's verdict

The claims also tie in with a coroner’s inquest into the death which said he was “unlawfully killed”.

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A Scotland Yard review into the death of Mr Williams said he was likely to have died alone and may have been taking part in a lone sex game.

The Metropolitan Police said Mr Williams’ death had been “subject to a thorough investigation” and inquests, and they were “not prepared to speculate”.