The reason why a character, who died in a certain book, of course never got a PoV in the next books from before his death is that it would confuse many readers and just seems awkward writing, since it also doesn't advance the plot that well. If another PoV of this character were really needed, one could better include it immediately before the death in the same book; that would also better fit in the context than a jumping back in the timeline for this dead character in the next book. It could still happen, but it's highly unlikely.