Warning! Spoilers ahead for Frasier season 2, episode 8.After 18 episodes, the new Frasier finally reveals what happened to Niles Crane. Ever since news about the Paramount+ revival was confirmed, questions about David Hyde Pierce’s possible return have been a big mystery. Even after Kelsey Grammer explained that the actor and Jane Leeves opted out of the project, which means that Niles and Daphne wouldn’t be in it, there was continued hope that they would eventually make an appearance. For what it’s worth, Pierce’s recent comments about returning in the Frasier revival seemed like an indication that a cameo was at least in the works.
https://screenrant.com/frasier-season-2-episode-8-niles-daphne-what-happened-revealed/