However, Millette's most significant work was in theatre: he was a major figure of Quebec theatre and, in 1990, received the Prix Victor-Morin for outstanding achievement in theatre in Quebec. He was a member of the Théâtre de Quat'Sous when it was founded by Paul Buissonneau in 1956.[2] Millette died suddenly in Montreal of a heart attack in September 1999. At the time, he was touring a one-man performance of Larry Tremblay's The Dragonfly of Chicoutimi. This role had earned him the Masque Prize (Quebec's annual prizes in theatre) for best acting performance.