Exhibit A: Kara Killmer's Instagram. As fans of the "One Chicago" franchise will know, it's been a hot minute since Monica Raymund announced that she was leaving "Chicago Fire." However ...

Killmer has played Sylvie Brett on the NBC show since 2014. A brand new episode airs Wednesday, March 10 at 9 p.m. ET/PT on NBC. ET exclusively debuts a first look from Wednesday's two-hour event ...