Charles Xavier's fate in the comics is not straightforward. Sometimes he's alive, sometimes he's dead. It all depends on the writer's creative decisions and the direction of the story at that time.
Well, in the current state of the comics I've followed, Charles Xavier remains deceased. However, comics have a way of bringing characters back or introducing alternate timelines and universes, so there's always a possibility for his return in some form.
In the comics, Charles Xavier's death could be attributed to multiple factors. Sometimes it was at the hands of a major adversary, and other times it was part of a broader narrative twist. It's a complex and ever-changing aspect of the comic world.