Garda Commissioner Martin Callinan said he had been deeply saddened to hear of his colleague's death.
He was a very popular member of An Garda Siochana, a very efficient member, someone who was revered both by his peers and members of the community where he served.
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ITV News spoke to Nick Channing-Williams who described the freezing conditions on board the car ferry that caught fire earlier today.
A widespread frost will affect the UK due to plummeting temperatures along with a lingering fog in several areas.