Poupart was an investigator situated in Paris.
While taking care of Jean de Mauvoisin's body, Poupart was visited by two Musketeers, Aramis and D'Artagnan. Contrary to his belief that carving up the body would produce answers, the Musketeers claimed that their experience on the battlefield was better to determine the cause of death. They ultimately decided that the victim was shot at close range.
Poupart also has Luca Sestini's stolen bag as part of the effects of one of the many unnamed corpses in his custody.