Surprising Truth: The Real Reason Mouse Abruptly Left Chicago PD

Summary

Mouse's character in Chicago P.D. gradually gained significance throughout the seasons, hinting at a deep connection with Jay and a mysterious military past.

Jay initially objected to Mouse's choice to rejoin the Rangers because of the detrimental effect it had on their mental well-being, resulting in a conflict between the two individuals.

However, in the end, Jay comes to terms with Mouse's decision to leave the CPD and recognizes that he doesn't have the authority to dictate his choices. Consequently, Jay aids in resolving Mouse's criminal charges before he departs.

Greg "Mouse" Gerwirtz became an increasingly important character in Chicago P.D. as the seasons progressed. However, he left the show in season 4. Mouse was first introduced in the final episode of season 1 as Jay's informant. While season 1 didn't provide much information about his military background or his past connection with Jay, it implied a long-standing friendship between the two. Mouse made a comeback in season 2, episode 16, playing a more significant role in the show's overall narrative.

Chicago P.D. showcased Jay's efforts to convince Voight, who was initially skeptical, to hire Mouse as the unit's civilian technology and surveillance expert. This not only demonstrated Jay's strong dedication to Mouse but also provided glimpses into Mouse's past, including his medical discharge from the military. The show built suspense around Mouse's military history, hinting at a convoy accident that Jay may have been involved in as well. Later on, this aspect of Mouse's backstory serves to explain why Jay was adamant about him staying on the team and not leaving Chicago P.D.

Jay & Mouse Clash Over Decision To Go Back To War

In Chicago P.D. season 3, the focus shifts primarily to Mouse, who takes on the role of the CPD Intelligence Unit's new civilian tech and surveillance expert. However, in season 4, new details about Mouse's past come to light. In one of the opening episodes, Mouse confides in Jay about his desire to rejoin the Rangers. Jay, aware of the toll it took on their mental health, strongly opposes Mouse's decision. Despite Jay's objections, Mouse remains resolute and even seeks Voight's assistance. He asks Voight to lie about his felony charge, claiming it was committed during an undercover operation. Voight doesn't make any promises, only saying he will consider it. As season 4 progresses, Mouse's determination to return to the military continues to grow. He even shares with Jay that his former unit has offered him his old position. Jay stands firm in his belief that Mouse should stay at the CPD and they argue about it, but Mouse refuses to listen, leading to an escalating clash between them.

Jay Gets Mouse’s Felony Charge Dropped

Mouse's emotional breakdown in front of the entire office brings an end to their fight. He expresses that he has never asked for anything else, leading Jay to finally understand and empathize with him. Jay realizes that he cannot make decisions for Mouse and that if he wishes to rejoin the Rangers, he must respect his choice. After discussing the next steps with Erin, Jay comes to terms with the fact that he must let Mouse leave. In an effort to help Mouse with his felony charge, Jay asks Platt to use his connections to clear Mouse's criminal record. With everything in place, Mouse leaves the CPD and returns to his unit.

Although the details of Mouse's decision to return to his former job are never revealed in Chicago P.D., the conflict between Jay and Mouse sheds light on how they perceive their military pasts differently. Jay has moved on from that phase of his life and has become comfortable in his role in the CPD Intelligence Unit. On the other hand, Mouse likely still identifies with his military background, finding purpose and a sense of self in it, which ultimately drove him to rejoin as a Ranger.

After Mouse's departure in season 4, Chicago P.D. season 9 subtly paid homage to him by including a photograph of him during Jay's military days. Samuel Hunt, who portrayed Mouse, went on to have a recurring role on Empire after leaving Chicago P.D., sparking speculation that he left the series to prioritize his new role. Despite the reasons for his departure, Mouse's presence and impact continued to resonate throughout Chicago P.D., particularly in relation to Jay's overarching storyline.