The man, John Kerins, was found dead in Bailieboro, Cavan, with gunshot wounds, but no sign of forced entry to his house. He had an interesting past.
The 49-year-old, who was originally from Co Meath, had lived in the area for a number of years.
He was a former senior detective based in the northeast and also in specialised units, including the fraud squad, in Dublin.
He left the force in 2009 on a medical discharge.
He was arrested earlier this year in Cork and questioned about handling stolen property.
Mr Kerins was a suspect in the disappearance of a local man over a year ago and was also suspected of involvement in the drugs trade.
Former garda detective found shot dead in Cavan - RT News