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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
It can be assumed that the main cast from season 11 will be returning en massethough Kara Kilmer will be leaving her role as Sylvie Brett, she will still be part of season 12's ensemble.
Source: https://screenrant.com/chicago-fire-season-12-cast-story/
The news comes about two weeks after it was reported that who plays Sylvie Brett will also exit the series in the twelfth season after featuring in a few episodes.
Source: https://collider.com/chicago-fire-season-12-alberto-rosende-leaving/