Maria Bailey has confirmed she will not be seeking re-election next month.
The Fine Gael TD for the constituency of Dún Laoghaire has been an elected representative for 16 years.
She was de-selected from the party's election ticket last November following the swing-gate controversy.
"It is with great sadness, that after 16 years as an elected representative in Dún Laoghaire, I will not be standing in this election," Deputy Bailey announced.
She said the past number of months have been "extremely difficult for me both privately and politically".
"This is a role I have been truly passionate, proud and humbled by," Ms Bailey said in a statement this morning.
"Both myself and my late father John Bailey enjoyed working for the people of Dún Laoghaire and it was a privilege to be their voice and public representative."
She thanked her team, colleagues and family for their support.