Journalist turned politician George Lee has announced he is to quit the Dail less than nine months after being elected.
The Dublin South TD, who won the seat for Fine Gael last June, said he was stepping down because he has had little impact on the party's economic policies.
Mr Lee said: "The reality, however, is that despite my best efforts I have had virtually no influence or input into shaping Fine Gael's economic policies at this most critical time.
"The role I have been playing within the party has been very limited and I have found this to be personally unfulfilling."
The former RTE economics editor won the seat vacated by the death of former Government minister Seamus Brennan.
He said his decision to quit was a difficult one but he was no longer happy in the party.
"When I entered politics last May, I made it clear that I was doing so because I wanted to try to play a new role contributing to economic policy formulation," Mr Lee said.
"After nine months of trying within the political system it is now my considered view that the role available to me within Fine Gael is not a role I am happy to play."
His win last June was hailed by party leader Enda Kenny as the father of two had become increasingly high profile in recent years with his reporting of the demise of the economy.
His resignation will deal a blow to the party's aspirations to be in government and Mr Kenny's hopes of becoming Taoiseach.
© Press Association