'Chicago Fire' season 3 premiere recap: This place will never be the same

It looks like season three is about to be just as intense as the past two. In this new clip from the Sept. 23 premiere, we see Casey going after Tommy Welch — in defense of his new fiancèe, of course!

'Chicago Fire' creators knew this would happen! On the season three premiere, one of our favorites was killed and fans went absolutely crazy on Twitter. Attention: spoilers ahead!

'Chicago Fire' creators knew this would happen! On the season three premiere, one of our favorites was killed and fans went absolutely crazy on Twitter. Attention: spoilers ahead!

The Chicago Fire have been definitively mediocre all season, but they're tough to beat at home and will come into this game needing to win to keep their faint playoff hopes alive.

Chicago Fire airs tonight at 10:00 p.m. on NBC and returns with an explosive first episode. Read on for all the spoilers we could find, including details on a major character's death. UPDATE: Leslie Shay was the team member who was killed. For more