The OECD said the UK economy may need more stimulus and a further round of quantitative easing may be necessary.
The OECD said UK growth remained flat, and is only expected to "pick up momentum" towards the end of next year. The Paris-based economic think tank forecasts that the UK economy will grow just 0.9% this year, after shrinking 0.1% in 2012.
Angel Gurría, the OECD's secretary general, said a "particularly bright spot" in the UK was employment figures.
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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