Related to my other question: Undead NPC Druid
If an NPC has been turned undead and later destroyed/resurrected does he retain the memory of being undead? Specifically the actions he took part in against the PCs? But also any details to the villain's plans, or other incidental info he may have learned while undead?
For reference purposes, he was intelligent undead but under the control of his creator.
(This hasn't happened yet but I'm trying to be a good DM & prepare for the effects of my actions)