Mourners at a wake and funeral may hold vital clues to the movements of a stolen car used in the killing of Detective Adrian Donohoe.
The navy car was stolen in a burglary in the town on that night between 11.30pm and 4.30am.
A removal service ahead of a funeral for local man Fergal Sharkey had earlier taken place. "On the night this car was stolen there was a large funeral in Clogherhead and this may jog some local people's memories of the night," gardai said in an appeal.
Details of the car were revealed as the Donohoe family opened their home in the Lordship area of the Cooley peninsula.
A steady stream of locals, colleagues, family, friends and GAA people queued to pay their respects and offer condolences to widow Caroline, herself a garda, and the couple's young children Amy and Niall.
PJ Stone, of the Garda Representative Association, former garda commissioner Noel Conroy, senior detectives, postmen and firefighters were among the first at midday with hundreds of others waiting in line.
A green and white chequered flag, the colours of Det Donohoe's beloved St Patrick's Gaelic Football Club, flew at half mast in the neat estate, nestling in the foothills of the Cooley Mountains. A blanket of mist and fog covered the sweeping hills.
Det Donohoe was a 41-year-old who was killed as he escorted credit union staff with bags of cash. He was shot in the head on Friday night as a gang stole 4,000 euro from the Lordship Credit Union.
A reward of 50,000 euro was later offered for information that leads to the arrest and prosecution of the killer(s) of Det Gda Donohoe. The money was put forward by the Irish League of Credit Unions, which represents credit unions in the Republic of Ireland and Northern Ireland.