A Blues team spokesman says Caron died Monday in Montreal.
Nicknamed the "The Professor" for his strong hockey memory, Caron worked under GM Sam Pollock in Montreal and helped the team win six Stanley Cups in the 1970s. The Canadiens won in 1971 and 1973 and four straight titles from 1976-79.
Caron was hired as general manager of the Blues in 1983 and spent a decade in the position. He helped the Blues reach the playoffs in each of his 11 seasons, and they reached the conference finals once, losing to the Calgary Flames in 1986.
He acquired some of the top players in franchise history, including Brett Hull, Adam Oates, Al MacInnis and Brendan Shanahan.
Caron retired in 1994, but returned in 1996 to serve as interim general manager.