Sir George Howarth will step down as the Member of Parliament for Knowsley after more than three decades.
Mr Howarth was first elected to represent the former Knowsley North constituency in 1986. He subsequently became the representative for Knowsley North and Sefton East in 1997 and Knowsley in 2010.
Born in Prescot, Mr Howarth held junior a number of junior roles in Tony Blair's government. He was Parliamentary Under-Secretary of State for Home Affairs and later for Northern Ireland.