I know what U mean. I can't see a main character getting killed off the show - unless the actor has a better gig in store- but what could be better thans Sons? Dexter perhaps
The actor may not have anything better, but maybe the writers know good story, and that killing someone will keep people watching. The Shield did it with Lem. And let's be fair, they may feel that they have done enough with the Character as both writers and actors. It isn't personal.