Olinsky is shocked when a criminal from his past returns after six years. The man is Dennis Lee, a human trafficker who killed several teenagers. Olinsky struggles to keep it together as he races ...

Kate Stanhope July 20 ... when Chicago P.D. returns for Season 2 this fall. "It shakes everybody up," showrunner Matt Olmstead tells TVGuide.com, "definitely for the next three or four episodes ...