, one of three shows set in Chicago that airs on
NBC, begins its fourth season on September 21
at 10 p.m. The season premiere will pick up right were season three left off, with Voight (Jason Beghe) under suspicion of killing the man who killed his son, Justin. Erin Lindsay (Sophia Bush) saw Voight confronting the killer, but will she give him up? Fans will have to tune in to find out.
"They’re not excusing anything that Voight did, but they’re also a little bit appreciative," executive producer Matt Olmstead told TVLine
about the team in season four. "Because when it all went down, he had them go [on] a goose chase across town to seal them off so they wouldn’t see anything. In their minds, he protected them, and then he did whatever he did. So for the most part, the unit is back to work, albeit on eggshells a little bit."
to meet the cast and see a preview of the season premiere, titled "The Silos." (Matt Dinerstein/NBC)