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2001

:: Gareth Williams, a maths prodigy from Anglesey, joins GCHQ, the British national security agency responsible for intercepting and decoding signals intelligence.

2007

:: His landlord and landlady have to rescue him in the middle of the night after he apparently ties his wrists to the headboard of his bed to see if he can "get free".

2008 - 2009

:: Store receipts suggest Mr Williams acquires a collection of women's clothing and footwear worth £20,000 during the period.

2009

:: He is seconded from GCHQ to MI6, the UK's foreign intelligence service.

2010

:: August 11 - Mr Williams returns to Britain from a conference and holiday on the west coast of the US. CCTV footage shows he goes shopping alone in London's West End the same day, visiting Selfridges department store.

:: August 12 - He goes shopping alone in west London, this time at Harvey Nichols and Harrods department stores and a Waitrose supermarket in the Knightsbridge area.

According to witnesses, he also pops into his London office but it is thought he goes only to drop off some documents.

:: August 13 - He goes to work and attends a show on his own by drag queen Jonny Woo at the Bistrotheque club in Bethnal Green, east London.

:: August 14 - Mr Williams goes shopping again, visiting the Holland Park area of west London and luxury department store Fortnum & Mason.

:: August 15 - He does yet more shopping in Knightsbridge, buying some cakes in Harrods and some peppered grilled steaks in Waitrose. The final CCTV image of him is captured at 3.05pm entering Alderney Street in Pimlico, where he lives in a top-floor flat half a mile from MI6's London headquarters.

:: August 16 - The last computer evidence of him being alive is Mr Williams looking at a cycling time trial website.

He is expected to return to work and has a meeting scheduled, but he never shows up. Colleagues fail to raise the alarm for a week.

:: August 23 - Mr Williams's decomposing naked body is discovered padlocked inside a large North Face holdall in his bath.

:: September 1 - Westminster Coroner's Court hears that a post-mortem examination has failed to establish the cause of death as his inquest is opened and adjourned.

:: September 24 - Sir John Sawers, the head of MI6, attends Mr Williams's funeral at the Bethel Methodist Chapel on Anglesey.

:: October 28 - Scotland Yard says toxicology tests have found no traces of drugs, alcohol or poisons in the spy's bloodstream.

:: December 22 - Detectives reveal that Mr Williams repeatedly accessed bondage websites, visited London gay bars and had several wigs and a collection of women's designer clothes.

Police also say it would have been impossible for him to lock himself in the holdall in which his body was found.

2012

:: March 30 - A pre-inquest review hears that Mr Williams's family suspect an agent specialising in the "dark arts" may have covered up his death.

The hearing is also told that detectives spent 18 months investigating a DNA sample found on the spy's hand before discovering it came from a forensic scientist involved in the case.

:: April 23 to present - The inquest into Mr Williams's death is held at Westminster Coroner's Court in London, attended by his family.