Prior to her courtship and marriage to Will, JJ displayed little interest in dating. She once went on a date with Spencer Reid to a Washington Redskins game, but little came of it romantically, although the two became very good friends. In the season 2 episode "Jones '', JJ first meets William "Will '' LaMontagne, Jr. a NOPD detective whom the team worked with while in New Orleans after a serial killer presumed dead following Hurricane Katrina resurfaces. It is revealed the following season that he and JJ had been seeing each other for the past year but kept it a secret as she wanted to keep her personal life away from the prying eyes of her colleagues, which Will initially misunderstood as her being ashamed of their relationship. When she finally reveals their relationship by kissing him goodbye in her office with the blinds open, it is apparent that her colleagues already knew about them.
when does jj meet will in criminal minds
the season 2 episode "Jones ''