Chicago Fire

Dora Madison played Alissa "Jelly Bean" Martin in 'Chicago P.D.', before she was introduced as Jessica "Chili" Chilton, a paramedic, in 'Chicago Fire'. Her "Chili" character did not appear in 'Chicago P.D.'.

Before starring as Firefighter Peter Mills, Charlie Barnett guest appeared in Dick Wolf's 'Law & Order: Special Victims Unit' as Chuck Mills, a rapist, and in 'Law & Order: Criminal Intent' as Dr. Sam Harris.

Filmed in Chicago, Firehouse 51 is actually Station 18, which is located at 1360 S. Blue Island Ave in Chicago.