<P> Stewart got his start doing local theater at the Landmark Theatre in Sutton, West Virginia, and eventually moved to New York City to study at the T. Schreiber studios . He was a company member of the 13th Street Repertory Theatre . He continued his theater in Los Angeles, performing in Light Bulb and Beacon alongside Robert Forster and Brooke Shields . </P> <P> Stewart appeared as an extra in The WB series Dawson's Creek episode "To Green, With Love". In 2003 he filmed a pilot for a Western for ABC entitled Then Came Jones . In the pilot he played the character of Bill Jenkins . </P> <P> Stewart later appeared as Sean Cleary the CSI episode "Bad to the Bone", which aired on April 1, 2004 . That same year, he also appeared in a commercial for Levi's 501 Original jeans . Stewart currently has a recurring role in Criminal Minds as Detective William LaMontagne, Jr., SSA Jennifer "JJ" Jareau's boyfriend and later, husband . </P> <P> Stewart got his break when he was cast as Brendan Finney in the final season of the NBC series Third Watch . As Finney, he played the son of IAB captain Cathal "CT" Finney . </P>

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