Confirmed dead.
http://collider.com/better-call-saul...ale-explained/
Michael McKean, who plays Chuck, and Saul co-creator Peter Gould spoke with Vulture about Chuck’s fate — after all, if we don’t see a body then is there a crime? But according to the duo, Chuck is indeed dead. McKean (who saw it coming), said,
It seemed like this was kind of the end of Chuck’s chapter in the life of Jimmy McGill slash Saul Goodman. It’s almost like the rock and a hard place — they can’t be too comfy together for too long or else you have to ask, what is the point of having Chuck? If Chuck is the person that Jimmy cared for and took care of, and who transformed into his antagonist, and then transformed into this wreck — this person who has no choice but to try and fix himself and has no tools for himself — it seemed like a logical step.
As for Chuck’s final words to Jimmy, and telling him that he meant nothing, Gould clarified that:
He wants to hurt Jimmy; he wants Jimmy to feel bad, too. That’s just me; that’s just the underpinnings. And you know, not everything he says is wrong. Chuck’s argument to Jimmy essentially is that conscience is great, conscience is important, but, if it doesn’t change your actions, what’s the point of it?
Something we’ve discussed in the writers room is: What’s really the difference between a person who does bad things and feels bad about it, and someone who does bad things and doesn’t feel bad about it? There’s some total of people that are basically fine either way. Chuck is being very tough on Jimmy, and he’s not completely wrong!