The widely-known Chicago Fire secret is that Matthew Casey returns this season.

He has to return because Casey is marrying paramedic Sylvie Brett.

The couple has tried the long-distance thing before, but now Brett is ready to move to Portland.

A new chapter to the Chicago Fire saga begins with Casey returning — maybe for the last time.

Brett is leaving Chicago, with actress Kara Killmer having already filmed her final scenes.

The current season has been building toward a wedding, and some details have come out.

When does Matthew Casey return to Chicago Fire?

Brett’s final episode of Chicago Fire has been revealed. NBC released details for that upcoming night, giving fans a heads-up.

And that night will be in conjunction with Jesse Spencer returning as Matthew Casey. Unfortunately, this could be his final appearance since Brett is moving away from Chicago to be with Casey.

That new Chicago Fire episode debuts on Wednesday,...