A book of condolence for Ballintubber councillor Anthony Waldon will open in Roscommon County Council's headquarters this morning.
The Tricolour and Roscommon flag will also be lowered to half-mast.
Councillor Waldron died suddenly at his home in Ballintubber over the weekend, while aged in his 60s.
He was first elected to the council 21 years ago and long-time colleague, Tom Crosby, has been paying tribute.
Joe Malone was a good friend and supporter of his - he's stunned by his death.