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He was arrested on Friday night by armed Gardaí.
A man in his 30's is still being held in custody this morning over the murder of Ian Baitson in Cobh.
He was arrested on Friday night after armed Gardaí carried out a raid on a premises in Cappoquin, Co. Waterford.
Mr. Baitson, a 33-year-old chef, died after being attacked with a sword, or machete-type weapon, last week.