Introduced in Episode 21 as a Detective from Robbery-Homicide, Upton eventually joins Intelligence, filling the vacancy left by Lindsay.
Season 4 marked the end of an era for two of the show's original leads and introduced a future mainstay: Chicago P.D. - Season 4
The season begins with Commander Emma Crowley (Barbara Eve Harris) investigating Voight and Lindsay for the murder of Justin Voight’s killer, a dark secret that strains their relationship. Introduced in Episode 21 as a Detective from
In a devastating multi-episode arc, Alvin Olinsky (Elias Koteas) loses his daughter, Lexi, in a warehouse fire, pushing him to a grief-stricken breaking point. Upton eventually joins Intelligence
A crossover with Chicago Fire (Season 5, Ep. 9) where Kelly Severide is suspected of vehicular manslaughter.