A minute's silence will be observed nationwide today at 12pm ahead of the funeral for Detective Garda Colm Horkan.
The brave officer was shot dead in Castlerea, Co Roscommon on Wednesday night.
A state funeral will be held for him in St James' Church in Charlestown, Co Mayo today.
Members of An Garda Síochána, Garda Staff, Garda Reserves and retired members of An Garda Síochána will parade at their local Garda Station/ permanent assigned Garda Station and observe a formal public one minute's silence at midday.
The gesture will be led by Deputy Commissioner John Twomey and the Garda Band at Garda Headquarters.
Garda stations across the country – including in Dundalk where slain officers Adrian Donohoe and Tony Golden both served – will follow suit.
In support of public health guidelines, An Garda Síochána requests that members of the public, wishing to express their sympathies and condolences also observe a one minute's silence at 12 noon at their homes.
A spokesperson said: "An Garda Síochána will post images of these remembrance silences on our social media pages with the #ColmRIP and request that members of the public show their solidarity by posting their images on social media using the same #ColmRIP."
Tragic Det Garda Colm Horkan is the 89th member of An Garda Siochana in the history of the organisation to have died while on duty.
Nicknamed Bear by those who knew and loved him, Colm was shot dead with his own service weapon on Wednesday night.
Colm was much loved both in his home of Charlestown and in Ballaghdereen in Co Roscommon where he served as a garda for 13 years.
Sadness has overwhelmed both towns as the nation mourns the death of the brave officer.
Colm was a talented GAA player who played for his local club Charlestown Sarsfield from a young age.
Mayo GAA are asking clubs and supporters to fly their club or county colours in memory of Detective Colm Horkan at midday on Sunday.
They posted on Facebook: "As a mark of respect to Detective Garda Colm Horkan and to support his family as best we can during this time we are asking our clubs and supporters to fly their club or county colours tomorrow at 12pm. #ColoursforColm #RIPColm."
While only a handful of heartbroken mourners are permitted in the church, hundreds are expected to line the streets to say a final farewell to the detective.
