Gareth Wyn Williams (26 September 1978 – c. 16 August 2010) was a Welsh mathematician and Junior Analyst for GCHQ seconded to the Secret Intelligence Service (SIS or MI6) who was found dead in suspicious circumstances at a Security Service safe house flat in Pimlico, London, on 23 August 2010.[1] The inquest found that his death was "unnatural and likely to have been criminally mediated."[2] A subsequent Metropolitan Police re-investigation[2] concluded that Williams's death was "probably an accident"
Police visited Williams's home during the afternoon of Monday 23 August 2010, as a "welfare check" after colleagues noted he had been out of contact for several days.[11] His naked, decomposing remains were found in the bath of the main bedroom's en-suite bathroom, inside a red bag that was padlocked from the outside, with the keys inside the bag.[12][13
https://en.wikipedia.org/wiki/Death_of_Gareth_Williams
MI6 'body-in-bag': Gareth Williams forensic evidence to be re-examined
'After his death, there was widespread speculation in the media that it could, in some way, be linked to the secret intelligence work that he was engaged in as a GCHQ officer.'
https://www.bbc.com/news/uk-wales-57448396
https://qalerts.net/?q=gchq