The US has criticised a decision by Google Executive Chairman Eric Schmidt and former diplomat Bill Richardson to visit North Korea.
State Department spokeswoman Victoria Nuland said: "Frankly, we don't think the timing of this is particularly helpful," citing North Korea's launch of a long-range rocket in December.
She said Schmidt and Richardson would be travelling as private citizens, not representatives of the US Government.
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Gary Davies, 50, is believed to have known the victim, 56.
The couple, married for more than half a century, had recently retired to Mount Pleasant.
Four EU countries in eastern Europe refused to take part in the meeting