I can't recall if there are rules or guidelines when converting a player character into a monster with an XP value and proper abilities so they are not over-powered. If someone could tell me if they exist or where they are, it would be much appreciated.
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In the Dungeon Master Guide there are some rules when creating NPCs, you should just pick the more important powers for this NPC when he was a PC, and make him likely to ressemble the PC. He will lose some features and powers, but you can manage to make the NPC stronger, but a PC will always be stronger than a NPC in the same level.
Check out the rules to create a NPC: Dungeon Master Guide pages 186-188.