One prominent One Chicago cast member has addressed the possibility of returning to play a dead character once more. The franchise is an interconnected universe of NBC shows following various public services in The Windy City, all of which were either created, co-created, or executive produced by Dick Wolf, who is also behind the Law & Order franchise. The universe kicked off with Chicago Fire, which premiered in 2012 and is now in the middle of airing season 13. Various spinoffs were later introduced as backdoor pilots in other shows within the universe.

https://screenrant.com/one-chicago-otis-return-after-death-chances-yuri-sardarov-response/