Which Chicago PD officer needs a doctor? Because there's a doctor's family here! According to an exclusive report from TVLine, Shameless actor Nick Gehlfuss will play Ryan Halstead, Jay Halstead's brother, on Chicago PD and will star in the planned Chicago Fire spinoff Chicago Med. Ryan's recurring character "is a playboy and a successful doctor. But he always avoids responsibility," said producer Matt Olmstead. "Once the situation becomes complicated, he disappears. He is at the point in the show where he has to start working hard and find his real life in Chicago." The Halstead brothers are finally reunited, "They are all happy to see each other," said Olmstead. "Ryan came to Chicago not to join Jay, but to ask Jay for help in dealing with some things." In addition, Golfs will also appear in "Chicago Fire" to pave the way for the spin-off series.