A key witness of a shooting finally speaks out to Intelligence to identify a shooter they've been after.

Season 5 Episode 4 "Snitch"
The Intelligence unit investigates a series of murders that has a personal connection with Atwater as his younger brother might be involved. Meanwhile, Upton questions Ruzek's actions following an altercation with a suspect. Also, Voight suspects that Dawson might be tipping off to the wrong people as his eye witnesses to the murders turn up dead.

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