He died on Wednesday night in Roscommon.
Offaly County Council has set up an online Book of Condolence to allow the people to express their sympathies to the family of Detective Garda Colm Horkan.
Cathaoirleach of Offaly County Council Cllr. John Carroll opened the online initiative on http://www.offaly.ie/bookofcondolence.
All messages of sympathy will be printed and forwarded in a Book of Condolence to his family.
It will close on Friday 26th of June.
Meanwhile, a man will appear in court again next week charged in connection to the murder of Detective Garda Colm Horkan.
The officer died on Wednesday night in Castlerea, Roscommon.
Stephen Silver of Aughaward, Foxford in county Mayo was brought before a special sitting of Castlerea District Court last night.
The 43-year-old made no reply when he was charged with the murder of 49-year-old Detective Garda Horkan.
The officers death followed a violent incident in Castlerea town on Wednesday.
Mr Silver kept his head down for much of the proceedings - but did say "unreal." and I had no firearm.
His solicitor asked for all appropriate medical assessments be carried out - and free legal aid was granted.
He will appear again on Friday at Harristown District Court via video link, and has been remanded in custody.
Midlands 103's Coronavirus News Blog: https://t.co/hFE11BmrnN
— Midlands103 (@Midlands103) June 20, 2020
Offaly Prize Bonds Holder Wins €500k
BNM Workshop Reunion Taking Place In Offaly Tomorrow
ICTU Reminds Employees Of The Right To Disconnect
Laois Town To Host Famine Commemoration Event
Plans For Billion Euro Data Centre In Westmeath Face New Appeal
Westmeath Councillor Advocates For More Remote Working Hubs
Midlands Homelessness On The Rise
Hundreds Without Power In Westmeath
Westmeath Domestic Abuse Support Service Reports Rise In Cases
Laois TD Highlights GP Gap
Call Made For 'Cost Of Disability Payment' in Budget 2027
Offaly Coffee Shop Listed Among Top 100 In Europe
Man To Stand Trial Over Midlands Tasering Accusation
Another Report Underlines Midlands House Price Inflation
Midlands Braced For Severe Thunderstorms
Sustainable Livestock Village Programme Launched For Tullamore Show
Offaly Woman Named National Carer Of The Year
Plans Lodged For 40 Year Solar Farm Development In Offaly
Midlands MEP Hosts Online Safety Initiative In Brussels
Oireachtas Report Highlights Planning And Infrastructure Reform Needs