9-1-1 guest star Lou Ferrigno Jr. reveals that his return as Tommy Kinard may depend on another series. It’s in the sixth episode of 9-1-1 season 8 that Tommy and Buck (Oliver Stark) break up. Ferrigno’s character decides to end the relationship, gently, essentially believing that Buck is moving too fast and putting too much stock in a relationship that isn’t built to last. The episode, “Confessions,” ends with Buck sharing a beer with his best friend Eddie (Ryan Guzman) on the couch.

https://screenrant.com/911-season-8-tommy-future-return-swat-conflict-lou-ferrigno-jr-response/