Can you tell me why this wont work?

This is a script that when a NPC dies gets xp to its killer I've made the script but it seems to be broken whats wrong with it?

local Humanoid = script.Parent.Bandit --Name of the mob 
function KILL() 
local tag = Humanoid:findFirstChild("creator") 
if tag ~= nil then 
if tag.Value ~= nil then 
local Leaderstats = tag.Value:findFirstChild("leaderstats")  --Connects to Leaderstats
if Leaderstats ~= nil then 
Leaderstats.XP.Value = Leaderstats.XP.Value + 5  --How much added per kill
wait(0.1) 
script:remove() 
end 
end 
end 
end 
Humanoid.Died:connect(KILL) 

I don't see a function for 'KILL' I'm not completely sure, but maybe you should write a function for KILL? like KILL = ......