The Garda Commissioner says Detective Garda Colm Horkan was hard-working, community-focused and brave.
Two plaques in memory of the 49 year old have been unveiled in Castlerea, Co Roscommon, where he was shot dead a year ago.
Commissioner Drew Harris and Minister of State James Browne joined his family at a ceremony in the town earlier.
Mary Claire Greally sends this report from Castlerea:
Commissioner Harris says Detective Garda Horkan loved working in Castlerea and tday was a solemn day and day to celebrate Colm's life: