How to find who killed a player?

I am making a Ko and Wo leaderboard and know how to find wos but I just cant figure out how you can find who killed someone which means I can't make the ko column count correctly (it doesnt count anything at all).

The thing is, no one actually "kills" someone. I don't have that much time so here is a quick summary: The way of counting kills is by "tagging" the player, within whatever script you use for your attack. Examples can be shown on the "linked sword". When a player dies due to this attack, the player that fired the attack is tagged, and that is put into further code into making a "Ko" system. It's easy with gears, could get tricky with other attacks. I'd love to help you out more, but your question seems more of a request. You have no script whatsoever, and want a Ko system handed to you, without even stating details.

I found this in models on ROBLOX, I hope this helps. Made by: Demonzombietoy

function onPlayerEntered(newPlayer)

	while true do
		if newPlayer.Character ~= nil then break end
		wait(5)
	end

	local humanoid = newPlayer.Character.Humanoid

	humanoid.Died:connect(function() onHumanoidDied(humanoid, newPlayer) end )

	newPlayer.Changed:connect(function(property) onPlayerRespawn(property, newPlayer) end )


end

function Send_DB_Event_Died(victim, killer)

	local killername = "unknown"
	if killer ~= nil then killername = killer.Name end
	print(victim.Name, " was killed by ", killername)

	if shared["deaths"] ~= nil then 
		shared["deaths"](victim, killer)
		print("Death event sent.")
	end
end

function Send_DB_Event_Kill(killer, victim)
	print(killer.Name, " killed ", victim.Name)
	if shared["kills"] ~= nil then 
		shared["kills"](killer, victim)
		print("Kill event sent.")
	end
end



function onHumanoidDied(humanoid, player)
	local stats = player:findFirstChild("leaderstats")
	if stats ~= nil then
		local deaths = stats:findFirstChild("Wipeouts")
		deaths.Value = deaths.Value + 0


		local killer = getKillerOfHumanoidIfStillInGame(humanoid)


		Send_DB_Event_Died(player, killer)
		handleKillCount(humanoid, player)
	end
end

function onPlayerRespawn(property, player)

	
	if property == "Character" and player.Character ~= nil then
		local humanoid = player.Character.Humanoid
			local p = player
			local h = humanoid
			humanoid.Died:connect(function() onHumanoidDied(h, p) end )
	end
end

function getKillerOfHumanoidIfStillInGame(humanoid)

	local tag = humanoid:findFirstChild("creator")


	if tag ~= nil then
		
		local killer = tag.Value
		if killer.Parent ~= nil then
			return killer
		end
	end

	return nil
end

function handleKillCount(humanoid, player)
	local killer = getKillerOfHumanoidIfStillInGame(humanoid)
	if killer ~= nil then
		local stats = killer:findFirstChild("leaderstats")
		if stats ~= nil then
			local kills = stats:findFirstChild("KOs")
			if killer ~= player then
				kills.Value = kills.Value + 0
				
			else
				kills.Value = kills.Value - 0
				
			end
			Send_DB_Event_Kill(killer, player)
		end
	end
end

game.Players.ChildAdded:connect(onPlayerEntered)