It's funny how the Olicity baby reveal completely overshadowed Echo Kellum leaving.
Weird that he thanked Katherine McNamara but uh yeah. He also repeated over and over again in his EW interview that he'd come back to guest star whenever asked, he just didn't want to be there full time because of family. And honestly he was the most useless character on the show so uhhhhh this is probably for the best. Time for Roy to come back in the modern day and get that Mark of Four tattoo (which Curtis was never mentioned to have received).