It’s hard to imagine Ambulance 61 without Sylvie Brett (Kara Killmer) after she’s been a staple there since Season 3. But now, Chicago Fire, in its 12th season, is moving forward without her ...

Ambulance 61, and Engine 51. With the season finale of Chicago Fire's 13th season just around the corner, viewers are speculating whether the character of Mouch will be leaving the series.