Overview
- Multiple outlets confirmed on Aug. 21–22 that Matthew Daddario will appear in Chicago Fire Season 15 as a firefighter candidate, joining a pool of new probationary firefighters.
- Da'Vinchi, previously announced as a new series regular, posted a behind‑the‑scenes photo that shows Daddario on Truck 81 and helped prompt the casting reports.
- Show sources say Daddario’s role is currently billed as a candidate with no public character name and an unclear episode count, described so far as a guest spot or possible recurring part.
- Production is underway for the season, which will premiere Wednesday, Oct. 7, 2026 at 9/8c on NBC and stream the next day on Peacock.
- The casting and production move follow reported creative turnover — Andrea Newman’s exit and Victor Terharn’s reported promotion — and come as original cast members Joe Miñoso and Dermot Mulroney are set to leave early in Season 15, creating narrative space to resolve the prior season’s cliffhanger.