After the death of his brother, Jimmy joins the force again helping Brett as a first responder.

Season 4 Episode 23 "Superhero"
Borelli deals with the fallout of the death of his brother Danny and takes it out on Boden. Meanwhile, Dawson is forced to find an apartment so she can foster Louie, Kidd continues to deal with her ex-husband. Also, Casey travels to an Alderman conference and Otis returns to 51. At the end of the episode, Severide and Kidd return to his apartment, but do not notice that Kidd's ex-husband is hiding there with a knife.


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