Ok, I hate to admit it because I don't recall the fellows name, but years ago I worked in a gaming store in Monterey CA and there was a fellow who claimed that he was one of the first DnDers, a personal friend of EGG, now in CA because he was in the Coast Guard.
We were skeptical of his claim, but he was never pushy about it, nor boastful, and as time went by we came to feel he was telling the truth. ( His name *was* in the group credits in the 1st ed PHB for whatever that meant)
Anyhow, his one claim to DnD "fame" was that he invented the Lich. Where or how he came up with the name he never said, but he was running an adventure and needed a powerful magic using undead for the final encounter. He did a little mythological research and came up with the lich.
Supposedly, when they were getting ready to copyright the very first DnD game EGG offered this fellow $25 for the "rights" to "his" Lich, which he accepted.
How true is the story? I've always more or less believed it, mostly because I believed him. I mean, if someone was going to fake being one of the original DnDers, don't you think they'd come up with someting more grandiose then one monster? Besides, if he was telling the truth about that, then all his stories about the early days of DnD and TSR were true, and there were some doosies!