A 45-year-old man has been arrested in connection with the murder of Danny McKay in Newtonabbey, Co Antrim.
The suspect from the New Lodge area of Belfast has been taken to the Antrim serious crime suite for questioning.
Mr McKay, 36, was shot dead at his home on the Longlands Road last month.
His funeral took place last Friday.
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RTÉ's Investigations Unit asks could the anti-malarial drug Lariam be linked to suicides among Irish Defence Forces soldiers.
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