The news of his departure in the first place came as a shock, and it almost didn’t feel real until Donnell himself confirmed it.
Well, first things first: Colin Donnell isn’t returning as a regular, or even as a recurring actor.
Connor was a huge part of Med from the very first season, and he had some big stories in Season 4, often with Ava.
Us Weekly reports that Donnell is only on board for the Season 5 premiere, which will allow Chicago Med to give the character an actual exit on screen.