I've seen several NPC's laying as if they are dead - some you can loot and then they sorta "pop" into rag-doll and die (make a sound and bleed etc.) - same if you shoot them with an arrow. I would guess they should have spawned in alive, but somehow they seem to have a "dead status" or something???
Specifically at Kjotves fortress after you defete him (before leaving to england) - a lot of NPC's laying around, but seems like they should have been alive and manning the fortress (if you loot them they die again)??? Have seen this a few other places in england as well???