<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 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>
who is jj 's husband on criminal minds
who is jj 's husband on criminal minds
Detective William LaMontagne , Jr.
Detective William LaMontagne , Jr.