I recently gave a lecture at Plymouth University about how notions of “The Undead” have evolved right over the full timespan of human history, pulling together many of the scientific aspects about the undead, ranging from archeology, anthropology and genetics.
The undead don’t exist.
At least, not anymore. But there was a time when the dead were troublesome creatures, liable to rise up from the grave and cause all sorts of mischief, wreaking havoc and spreading death. We know this because there is no shortage of historical accounts, including official government reports: