If you are talking about NPCs vs Players, then you could probably use this: 
 
sub EVENT_SLAY - Triggered whenever an NPC kills someone. 
 
And then just use quest globals to keep track of your scores. 
 
For players killing NPCs, you can just use this: 
 
sub EVENT_KILLED_MERIT - Triggered on NPC death when you are in the group credited with doing the most damage to said loottable NPC. 
 
If you want to keep track of player vs player, I haven't tried it, but maybe you could use EVENT_ZONE and check the players current HPs when they zone to see if they are <= 0.  If so, then you up the counter for them being killed, but I don't know how you would up a counter for killing another player. 
		
	
		
		
		
		
		
		
			
		
		
		
		
		
		
	
		
		
	
	
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