I’m not 100% sure if this is the right stack, but I’d like an expert opinion for a novel. The antagonist is a serial killer who uses magic circles to remove all hemoglobin from his victims, while leaving everything else intact. Obviously, this would lead to anoxia/shock and death. Would an autopsy reveal anything noteworthy, aside from colorless blood*, visible to the naked eye?
*Google tells me that iron gives blood its red color, and that hemoglobin-less blood (as seen in some fish) is clear. Research I’ve done so far: reading a medical journal article on asphyxiation, this webpage on anemia