Is this possible?

I've found events that fire when an actor dies, but I see nothing that is called when an NPC kills someone; I'd prefer to do this in a way that doesn't require attaching a script to all races for sentient beings, since that would be a major compatibility killer, and, as far as I can tell, the only way to do this seems to be by attaching a script to all NPCs that fires when they die, and checks if the PC killed them.

I might have hope of working this out on my own if the NV GECK used Papyrus, as I've had experience modding and writing scripts for Skyrim, but as things are I'm a bit lost.