Zombies result from a bad resurrection when using the paranormal career path reward object (with University). If you don't pay the grim reaper enough simoleons your sim gets back their loved one in a shambling state of undeadedness
... Meaning that when you resurect a sim using the thing Mirelly explained and don't pay a good prise, your sim will come back as a zombie. Just thought I'd make that a little bit clearer. :flippant:
muffin-tacos is hereby appointed the official Mirellian-to-sensible translator :flippant: :flippant: ... your turn