Det Gda Donohoe's widow Caroline, also a garda, was based with him at Dundalk station.
The couple met while in Training College and although neither are from Co Louth, they were both welcomed into the community with their children Amy (7) and Niall (6).
He was particularly passionate about Gaelic football and was a member of St Patrick's GAA club.
He won a county medal with the club in 2003 and in the past year helped with youth training.
The Cavan-born garda gave up his time to train the under 7s side -- more than 60 six-year-olds every Thursday -- and he had an "amazing way with them", according to locals.
Adrian's brothers Colum and Martin are both gardai, in Swords and Navan.
This week, his colleagues in the gardai have rallied round -- officers cancelling holidays to help hunt for his killers.
Colleague Garda Robbie Peelo said that the force is keen to support his family. "Everyone in the station is devastated but people are methodically going through the day-to-day business of being gardai," he added.