Career
Born in Saint-Paul-de-Montminy, Quebec, he was a lumber merchant and merchant by career. Létourneau defeated Roberge in the 1958 election and was re-elected to a second term in 1962. In the 1963 election, Liberal candidate Yves Forest defeated Létourneau at Stanstead.
Létourneau made one final attempt to return to Parliament in the 1965 election but was again defeated by Forest.