Ohio investigators search for answers in the decades-old murder of 10-year-old Amy Mihaljevic; a retracing of Amy's steps from the day of the kidnapping.
Police believe they have a serial rapist and murderer, but DNA testing and research leads to another arrest and conviction.
In 1976, 182 war veterans in Philadelphia become hospitalized with pneumonia-like symptoms and 29 die; the disease resurfaces every few years.
Local and national perspectives on the latest news.
Ringo Starr's "Peace and Love" birthday celebration; Dylan Marlowe and Dylan Scott (song "Boys Back Home"); from the beach to downtown Nashville: the free event with host Brian Kelley; Russell Dickerson (song "Famous Back Home").
Severide agrees to a bone marrow donation; Casey and Dawson attempt to find harmony at home; Otis and Mouch plan to create a PSA to encourage people to join the Chicago Fire Department.
Voight and the team help ASA Nina Chapman pursue a drug runner who dodged prison years ago after Chapman's informant mysteriously disappeared; the investigation takes a turn when Voight uncovers a damaging secret from Chapman's past.