First, necrophilia*
Second, depends on how you define it. Is it only dead, inanimated, unable to consent corpses, or does it include undead, animated, consenting corpse-related beings?
If the former (the first) then ALL vampires from virtually
any lore would count (only "genetically engineered" ones that are strictly
not "undead" wouldn't). That would be a major turn off for a great number of people as part of vampire lore is that they are greatly capable of seduction.
Additionally there are erotica and outright hentai that involve zombies/mummies, so, yeah...
Also, if you
really wanted to be a "stickler" about it, what about people who were pronounced dead, but revived? In reality a person is "considered dead" if their heart stops (generally beyond a certain amount of time, but not purely), so if their heart was able to be restarted, or, better yet, if their heart was
replaced what would that make them?
And add in fantasy resurrection which is anywhere from "clearly dead" (even given modern knowledge) to completely rebuilding the body "resurrection," (a la WoW or "My Cheat Skill [Resurrection] Revived Me, and I Ended up Resurrecting the Ancient Demon Lord’s Army. ~The Strongest Healer That Won’t Let Anyone Die~") and it starts getting questionable.
Hell, what about reincarnation? New body, but the person
was undeniably dead... (I admit that
this is too far)