Codebreaker found in bag attended US security conference before death (2012)

He might have been a pre-Snowden that didn't escape:

Williams was unhappy with his work environment at MI6 and felt he didn't fit in with his colleagues. During the inquest, testimony revealed that the coder had conducted unauthorised searches of an MI6 database

also: http://www.wired.com/threatlevel/2010/08/codebreaker-death/

Or he might have been simply killed for sport. Or because he wanted to be. Or insert claim here

The American government is killing British agents for sport? Ye gods, how depraved have they become?!

God no, the Americans were far too busy writing juicy memos to get involved in this one. I think we all can glean from the nature of his death that it could only have been...

dum dum dum

... The Icelandic Government.

That's right folks. Due to his persistent mockery of eating rotten shark, those heartless Icelanders decided to shut him up for good. The method of dispatch leaving his body in a similarly putrescent state as their favourite delicacy.