I just read on tvline.com that...
Quote:
If you want to find out what happened to Chicago Fire‘s MIA Casey after Tuesday night’s shocking season ender, you may have to watch Chicago P.D. this fall.
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The whole article is here.
‘Chicago Fire’ Season 4 Spoilers — Gabby Pregnant, Casey Kidnapped or Framed? | TVLine
They talk about Brett/Roman also.