English: The Grave of Gareth Wyn Williams (1978 - 2010) in Ynys Wen Cemetery, Valley, Anglesey.
He was a Welsh mathematician and employee of 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.
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Translated from Welsh, the inscription on the headstone reads:-
In loving memory
of
Gareth Wyn Williams
Mathematician
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