https://deadline.com/2025/08/nick-gehlfuss-return-dr-will-halstead-chicago-med-season-11-1236498043/

Gehlfuss, who played Dr. Will Halstead on Chicago Med's first eight seasons, will guest-star in Season 11. It's not yet known how many episodes he'll be back for.

Chicago Med's Returning Original Star Risks Ruining Their Character's Ending (https://screenrant.com/chicago-med-season-11-nick-gehlfuss-will-halstead-ruin-ending/)

In a shocking turn of events, an original Chicago Med star returns in season 11 after exiting the show three seasons ago, but it might be a mistake.