While Will is mentioned throughout the series, he is not a regular character and only appears in a few episodes. He is usually shown when the focus of the episode is on JJ's personal life or when the team is experiencing a situation that impacts them on a personal level.
Here are some key appearances:
* Season 4, Episode 21 ("The Fisher King"): Will's character is first introduced when JJ's son is kidnapped by a serial killer.
* Season 5, Episode 20 ("The Fight"): Will is involved in a major storyline when JJ's son is threatened.
* Season 9, Episode 13 ("The Lesson"): Will is seen in an episode where JJ and her family move from Virginia to Washington D.C.
* Season 11, Episode 21 ("A Beautiful Disaster"): Will's character plays a critical role in helping JJ cope with a traumatic event.
Although Will is not a main character, he is a crucial part of JJ's life and provides her with emotional support.