"Chicago P.D." has bid farewell to many characters in its 13 seasons, but Brian Geraghty had one of the shortest tenures on the show. The actor played patrol officer Sean Roman in season 2 and 3 of the series before his character was shot and injured in the line of duty and ultimately decided to leave Chicago to start over in San Diego. Behind the scenes, it turns out Geraghty wanted to pursue other projects and was able to do so since his "Chicago P.D." contract ran on a season-by-season basis.

The second installment in the One Chicago universe, "Chicago P.D.", was created by the great Dick Wolf and premiered in 2014, two years after the original series, "Chicago Fire," debuted. Following the Intelligence Unit of the 21st District of the Chicago Police Department, "Chicago P.D." has prov

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