He played in 67 games over parts of four NHL seasons with the Philadelphia Flyers, Carolina Hurricanes, and Mighty Ducks of Anaheim.

A junior from Baie-Comeau Drakkar of the QMJHL, he made his professional debut at the tail end of the 1999–2000 season with Flyers affiliate, the Philadelphia Phantoms of the American Hockey League.

[1] Prior to the 2005–06 season on October 3, St. Jacques was traded by the Hurricanes, to the Mighty Ducks of Anaheim for Craig Adams.

In the 2006–07 season, on December 28, 2006, St. Jacques was traded from the Ducks, along with P. A. Parenteau, to the Chicago Blackhawks in exchange for Sébastien Caron, Matt Keith and Chris Durno.

After three seasons with Ingolstadt, he signed with another DEL team, the Struabing Tigers, on a one-year contract on June 3, 2011.