Gagnon came up through the Windsor minor hockey system and played with the city's Junior B team before enrolling at Colgate University in 1987. He played in the NCAA for three years and was the ECAC Player of the Year in 1990.

The Detroit Red Wings signed Gagnon to a free-agent contract in the summer of 1990 and it was that year when he played his only two NHL games. He continued to play pro hockey for another eleven years in the minors, mostly in the ECHL where he was twice named the league's playoff MVP in 1991 and again in 1994. He last played with the Roanoke Express of that league in 1999-00.

Courtesy of the Hockey Hall of Fame