CHICAGO P.D. Season 4 Episode 4 Photos Big Friends Big Enemies : A SHOOTING OUTSIDE OF A CONCERT LEADS TO A TANGLED WEB OF GANG-RELATED VIOLENCE. – When a car plows through a crowd of concert goers and gunfire erupts, Lindsay (Sophia Bush) and Ruzek (Patrick John Flueger) are on the scene. Unsure of the motive and concerned a terrorist group may be responsible, Voight (Jason Beghe) orders in Homeland security, customs and the F.B.I. to assist. At the same time, Burgess (Marina Squerciati) spots Atwater’s (LaRoyce Hawkins) brother, Jordan (guest star Ahmad Nicholas Ferguson), out where he shouldn’t be. The team use their connections to throughout the city to bring some peace to the community before more blood is shed. Also starring Jon Seda, Jesse Lee Soffer, Elias Koteas and Amy Morton. Guest starring Marlyne Barrett, Kenneth Tyrone Burns Jr., and Li Jun Li.