Tory MP Chris Kelly has said he will stand down at the 2015 general election.
The Dudley South MP becomes the latest member of the 2010 intake of Conservative MPs to quit the Commons after a single term.
In a statement on his website he said he was "proud to have served the good people of Dudley South for the past five years" but did not give a reason for his decision.
He said: " I would like to thank all those who have supported me since I was selected for Dudley South in September 2007. I would especially like to thank all those who voted for me at the general election in May 2010 and all of the friends and supporters who helped me for that election, as well as those who have supported my efforts since.
"I am proud to have served the good people of Dudley South for the past five years."
The Eurosceptic MP won Dudley South from Labour in 2010 with a majority of 3,856.
Fellow Tory MP Conor Burns said: "Very disappointed my colleague Chris Kelly will not contest his Dudley seat at the next election. We are losing the wrong people."