In the early morning hours of July 7, 1972, Jean Guy Champagne and his 24-year-old co-worker Jean Gravel left the Rio Bar in downtown Trois-Rivières, Québec, and were never seen again. A missing persons report was filed on July 10, 1972. Champagne was 25, described as 5 feet 11 inches and about 163 pounds, with brown hair, brown eyes and a scar on his chin. He was last seen wearing a green cotton coat over a white cotton shirt, green cotton pants, black shoes, a silver wedding band on his left ring finger and a watch, possibly a Timex.

The Sûreté du Québec has said the investigation suggests the two men may have been victims of a double homicide, but no definitive evidence has been publicly released to confirm that. The initial search produced no clues and the case remains unresolved, leaving families and the community without answers.

Did anyone in Trois-Rivières in July 1972 have information about the Rio Bar that night or the movements of Champagne and Gravel after they left work?