Roscommon/South Leitrim TD Frank Feighan will not contest the next general election.
The Fine Gael deputy - who faced severe criticism for the Government's decision to close Roscommon's emergency department - says it is a personal decision.
Deputy Feighan, who has served as a TD since 2007, has thanked his supporters - saying he always tried to be honourable and decent.
“Roscommon Hospital will always be associated with my name," the TD said in a statement. "And I'll always take pride in the fact that not only is Roscommon Hospital safer, but has a long term future with a €20m investment plan taking place there. The introduction of the air ambulance and advanced para-medics has saved many dozens of lives.
“My work as a TD continues. I will continue to fulfil my mandate as the local Fine Gael TD right up until Polling Day, whenever that may be, with energy and pride," he added.
The Taoiseach has paid tribute to him, highlighting his chairmanship of the Good Friday implementation committee.
"The passion, energy and commitment he has brought to both of these roles have helped to foster greater British Irish relations, which will be evident for many years to come," Enda Kenny said.
