Fianna Fail TD Jim Glennon announced today that he will not contest the next General Election.
The Dublin North representative is to leave politics at the end of the current Dail to pursue interests in the private sector.
Mr Glennon has already informed party leader, Taoiseach Bertie Ahern, of his plans to quit.
He said it was now important for him to give Fianna Fail time to plan the retention of his seat in the General Election.
"Having discussed my plans with my family and An Taoiseach during the summer, I have now spoken again with An Taoiseach and have informed him of my decision," he said.
Mr Glennon, who was born, raised and still lives in North Fingal, said he has been proud and honoured to represent his community in Dail Eireann since June 2002.
He paid tribute to the people of Dublin North for the confidence, trust and support they have given him throughout the years.
"There's nothing quite like the honour implicit in the endorsement of one's own community and the commitment of friends and supporters from one's own home area and further afield," he continued.
"I believe I've done my best for my community with the help of a wonderful staff and support team and the constant active support of my family. Now it's time to move on."
A former rugby international player, Mr Glennon has been an active backbencher, and has taken a prominent role on several issues.
"Under Bertie Ahern's leadership, this country has been transformed over the past 10 years," Mr Glennon added.
"It has been a wonderful time to be in politics, and to be a member of a political party that has emerged from difficult times with new strength and confidence."