Nailah Franklin, a Chicago pharmaceutical rep, came from a large loving family that always stayed in touch. So when one night in 2007 she stops returning calls, it's reason for concern.

In July 2011, Nique Leili, a business executive and mother of three seemingly vanished without a trace.

Tensions come to a head and careers are put in jeopardy when interim Chief Pridgen squares off against Casey.

Firehouse 51 gets a visit from an old friend of Severide’s while Mouch faces his fears about meeting his kid.

Police discovered a chilling connection between two victims but did they have a serial killer on their hands?

It started as a call for firefighters to respond to a burning house, but when they found a young mother dead, tied to her bed inside the home, the pressure was on the police to find a killer.

A dog finds an unrecognizable body in a park.

An elderly lady is found wondering inside in a home that she was familiar with as a child.