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The men are being questioned under Section 50 of the Criminal Justice Act. The 35-year-old father of two was shot dead at the Topaz petrol station on the Ennis Road on the outskirts of the city last Monday morning. A man in his fifties was arrested on Thursday in the north side of the city and is being held at Roxboro Garda Station. A 29-year-old man arrested on Monday night is also being detained for questioning.