Watch Chicago PD Online: Season 4 Episode 15

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How did Ruzek feel about being placed on patrol duty?

That was addressed on Chicago PD Season 4 Episode 15 when he returned from his undercover assignment. 

Who was he paired up with?

Meanwhile, Lindsay was tipped off about a father looking to avenge his daughter's death. 

This resulted in Olinsky going undercover as a hitman for hire while Gang Intelligence reinvestigated the original case. 

Use the video above to watch Chicago PD online to get caught up on the latest drama for the characters on this gritty drama series. 

Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.

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