Brian Geraghty

Brian Geraghty has joined the cast of Chicago P.D., according to The Hollywood Reporter.

The Boardwalk Empire alum, whose credits also include Ray Donovan and True Blood, will play Sean Roman, Burgess' (Marina Squerciati) new partner.

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"He was going to be a third generation smelter in Chicago, but he had uncles who had been inhaling copper and nickel," showrunner Matt Olmstead recently told TVGuide.com of Officer Roman." He was scheduled to go down that road until they closed the plant down. He also has perspective in his life of, 'I know what hard work is.' He's a guy who really has a bounce in his step and also helps Burgess realize like, yeah, actually the uniform's a pretty good place to be for however much longer she is going to do it."

What do you think of the casting?

Chicago P.D. returns Wednesday, Sept. 24 at 10/9c on NBC.