Mario Hudon was 29 when he was last seen in Lévis, Québec, on May 16, 1983. He was described as medium build, about 1.73 meters tall and 72 kilograms, with brown hair and brown eyes. At the time he vanished he was wearing a white Makita jacket and a blue jean vest and pants; burn scars on his wrists were noted as distinguishing marks.

The Service de police de la ville de Lévis opened an investigation and has kept the file active. Public appeals have been made over the years asking anyone with information to come forward; tips can be submitted anonymously and will be treated confidentially. Few public leads are recorded, and the circumstances of his disappearance remain largely unexplained.

If anyone in Lévis or the surrounding area from that time remembers Mario, his movements on or around May 16, 1983, or any detail that could help, please share what you know.