Debbie Grayson didn't die in Invincible Season 3. On the othe hand, the comics from which the show has been adapted don't explicity mention the cause of her death, hinting that she likely passed away ...
All the while, Nolan Grayson has been out in a Viltrumite prison and awaiting his execution. That might have been the case in the second season, but the third season really changed things as he ...