Under the Gun

Also available on the NBC app

Casey agrees to participate in a sting operation to catch Hallie's murderer, but when the plan goes haywire, Casey finds himself in the clutches of a ruthless killer.

Appearing:Jesse Spencer
Tags: Casey, train, chase, murderer, sting, police, Chicago pd, el train, gun, gunpoint, hostage, voight, Antonio, pursuit
S1 E234 minExcerptDramaPrimetime
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