Casey's run for alderman takes a bad turn when billboards about his personal life go up by his rivalry

Season 4 Episode 16 "Two Ts"
Meanwhile, Brett and Borelli investigate a possible kidnapping case with the help of Officer Sean Roman and Nurse Maggie Lockwood. Also, the guys at 51 try to throw Mouch a bachelor party, but Trudy's half brother takes charge of it. It is revealed that Severide and Kidd have an awkward past.

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