Special Guest Stars Marina Squerciati as Officer Kim Burgess Nick Gehlfuss as Dr. Will Halstead Jason Beghe as Sergeant Hank Voight Yaya DaCosta as Nurse April Sexton Sophia Bush as Herself (Detective Erin Lindsay) Marlyne Barrett as Charge Nurse Maggie Lockwood Oliver Platt as Dr. Daniel Charles Brian Tee as Dr. Ethan Choi S. Epatha Merkerson as Sharon Goodwin Torrey DeVitto as Dr. Natalie Manning Elias Koteas as Detective Alvin Olinsky Carl Weathers as State's Attorney Mark Jefferies Guest Stars Randy Flagler as Firefighter Harold Capp Charlotte Sullivan as Nurse Anna Turner Barbara Eve Harris as Commander Emma Crowley Co Starring Anthony Ferraris as Squad 3 Driver Tony Ferraris Steve Chikerotis as District Chief Steve Walker Erin Breen as Lt. Alexa Hubble Alex Weisman as Paramedic Allen Chout Mindy Bell as Suzie Wilder Patti Vasquez as Nurse Desmond Gray as Paramedic Desmond Mia Hulen as Marcy Prescott John Victor Allen as Officer Albertine Alina Taber as Lexi Olinsky Angela Morris as Cathy Jonathan Seda, Jr. as Young Man Jessica Cloud as ICU Nurse Sofia Syed as Distraught Young Woman Glenn Obrero as Survivor Kendall Zwillman as Older Woman Walt Sloan as Older Man Desiree Gonzalez as Young Woman in ED Jordan Brodess as Todd Cisco Cotto as News Reporter Steven Sean Garland as Barry Kimball Myles Gillespie as Bystander Uncredited Anne Lockhart voices Dispatcher