The future of a lead doctor on "Grey's Anatomy" is unclear after their firing before the Season 22 finale.

Dr. Richard Webber (James Pickens Jr.) fired Dr. Benson Kwan (Harry Shum Jr.) offscreen in the penultimate episode of the ABC series' latest season, aired Thursday, April 30. Richard fired Kwan after discovering the Grey Sloan Memorial Hospital surgical resident had secretly given a patient an experimental, FDA-denied treatment earlier in the season. He confirmed the move to longtime Dr. Miranda Bailey (Chandra Wilson), who previously took the blame for the incident.

USA TODAY has reached out to the show and Shum's reps for comment.

The shakeup is leading up to the Season 22 finale, in which the fate of two longtime core characters is a bit clearer.

Kevin McKidd and Kim Raver to leave 'Grey's Anatomy' after 16 seasons