01:58 — Meet Amanda's estranged husband.
01:05 — Kate's assistant is finally caught.
01:09 — Did he kill Kate while he was drunk?
01:38 — Detective Cornell finds a skeleton in Eric's closet.
01:22 — Eric finds out Kate had a big secret.
01:13 — Cornell is concerned about contaminated evidence.
02:24 — Detective Cornell interviews a surprising witness.
00:46 — Cornell wants to know if Eric was on the roof.
02:17 — Get introduced to the new cast and characters.
01:02 — Amanda warns everyone that they're going to be suspects.
03:17 — A string of discoveries leads to the source of the helicopter crash landing.
02:45 — When Donna goes into labor early, Boden and Severide must perform an extra-special special delivery.
02:48 — Severide rediscovers an emotional memory from Shay's past.
02:47 — Dawson races to find a working water source during her first fire.
03:02 — A rooftop fire forces Casey and Dawson into an emergency exit plan.
04:05 — Joined by Shay's sister, the firehouse holds back tears during an emotional dedication for their fallen paramedic.
01:22 — Casey surprises Dawson with a romantic, rooftop proposal.
01:47 — Mills and Brett race to rescue a musician in a bizarre - but life-threatening - predicament.
02:29 — Mills overcomes zip ties and loaded guns to shock his and Brett's captors.
02:36 — A thriller centered on two archaeologists in search of a lost treasure in the catacombs below Paris.
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Here's how everything changed in "Chapter 6"