He represented Yamaska in the Legislative Assembly of Quebec from 1874 to 1875 as a Conservative.
He was born in Baie-du-Febvre, Canada East, the son of Joseph Duguay and Anne-Scholastique-Olive Beauchemin, and was educated at the Collège de Nicolet.
Duguay was one of the pioneers of the dairy industry in the Yamaska region and owned a number of cheese-making facilities.
He ran unsuccessfully for reelection to the Quebec assembly in 1890.
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