Watch Chicago Fire Online: Season 4 Episode 20

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What did Casey receive in the mail?

OnĀ Chicago Fire Season 4 Episode 20, Casey was shocked to the core when a suspicious package arrived for him in the mail.

Elsewhere on this addictive drama, Severide had to watch Holloway's young son as she testified in court, but how did the outcome affect him?

Also, the squad responded to a fire at an art gallery, but was it another arson case they had to solve?

Use the video above to watch Chicago Fire online to get up to speed with the latest drama.

Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.

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Chicago Fire Season 4 Episode 20 Quotes

Nelson: Al Nelson, I'm with the Board of Ethics. I'm here to discuss the bribe you received.
Casey: I didn't realize the Board of Ethics would be involved.
Nelson: No? Do you know what the Board of Ethics does?

JJ: She likes you.
Severide; Your mom?
JJ: She calls you Kelly. Ever since my dad died, she calls almost every guy "nitwit", but you're just Kelly.