Duquet articled as a notary with Joseph-Narcisse Cardinal and then studied law with Chevalier de Lorimier.
In 1837, he continued his training as a notary with his uncle Pierre-Paul Démaray at Dorchester (later Saint-Jean-sur-Richelieu).
Démaray was arrested for high treason in November 1837 but was freed by a group of Patriotes while he was being escorted to the jail at Montreal.
At a trial in November 1838, he was sentenced to death for the crime of high treason with a recommendation for executive clemency.
In 1858, his remains were moved to the Notre Dame des Neiges Cemetery and buried under a monument dedicated to the Patriotes of 1837–8.