S04E17 What Happened to Courtney

• Sezonul 4, episodul 17
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• Difuzat marți, 29 martie 2016
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• 42 min

Severide and Cruz find a child's remains inside a chimney while investigating a possible carbon monoxide leak inside a home. In other events, Casey braces for the worst in his run for alderman while Alderman Becks continues to bad mouth him to the press.