Two memorial plaques in memory of Detective Garda Colm Horkan have been unveiled during a ceremony in Castlerea in Co Roscommon.
Det Garda Horkan was fatally shot while on duty on 17 June 2020, and he died from his wounds in the early hours of the following morning.
His father Martin unveiled a memorial plaque on the main street in the town, at the scene of the fatal shooting.
Det Garda Horkan's brothers Dermot, Brendan, Aidan and Pádraic and his sister Deirdre were also in attendance.
Proceedings then moved to Castlerea Garda Station where a second plaque in Det Garda Horkan's memory, and in memory of fellow fallen colleagues Detective Garda John Morley and Garda Henry Byrne, was unveiled by Garda Commissioner Drew Harris.
Det Garda Morley and Garda Byrne were both stationed at Castlerea when they were killed on 7 July 1980 while responding to a bank robbery in nearby Ballaghaderreen.
Speaking at the event Assistant Commissioner Barry O'Brien spoke of the "extraordinary courage, fortitude and dignity" of the three men's families.
Assistant Commissioner O'Brien said he was also struck by the "very human stories" of each of the three men's last day.
"Colm watching Ascot with his Dad Marty, Shane's [John Morley's son] entreaties to his father to play a game of tennis in the garden. I have no doubt that Henry, if he's anything like me had probably neglected to complete some job in the house before he went on duty," Assistant Commissioner O'Brien said.
On June 17, 2020 our colleague Detective Garda Colm Horkan went to work for what would tragically be his last tour of duty. On the night of June 17 & into June 18 Colm was fatally wounded protecting the community he served. Today we remember. pic.twitter.com/sPQWcANC0w— Garda Info (@gardainfo) June 19, 2021
Commissioner Harris described Det Garda Horkan as a "hero".
"We know that from the outpouring of grief following Colm's death, the stories of compassion and kindness, expressions of love and appreciation, that Colm was very much a hero.
"Colm Horkan died trying to make this country a better place and with his last act he defied fear and epitomised the bravery of members of An Garda Siochana display on a daily basis."
On Thursday, Mr Harris paid tribute to Det Horkan saying he was the "epitome of what all of us in An Garda Síochána should aspire to be - professional, hard-working, supportive, community-focused, and brave".
Minister of State James Browne said that throughout Det Garda Horkan's 24 years of service as a member of An Garda Síochána and as "talented stalwart" of his local GAA club, "he embodied that grassroots ethos, shared by both the GAA and the gardaí, commitment to family, community and country."
Superintendent of the Castlerea devision Thomas Colsh said that the plaque outside the station was a testament from gardaí in the district that the memories and legacy of Colm Horkan, John Morley and Henry Byrne would never be forgotten.
"The baton will securely and firmly be passed to the next generation of police men and woman who will serve in this district," Superintendent Colsh said.
A close friend and former colleague of Detective Garda Horkan, retired Sergeant John Hynes told RTÉ News that it had been a difficult day after what had been a difficult year.
He described Det Horkan as "a unique person, a unique friend and a unique policeman, an absolutely wonderful policeman".