How to get the killer of a victim?

The code below goes into the enemies, it gives the killer gold and xp. But I don't know how to make it know who killed it.

local gold = script.Parent.Config.Gold.Value
local exp = script.Parent.Config.XP.Value

local Humanoid = script.Parent.Humanoid
function PwntX_X() 
local tag = Humanoid:findFirstChild("creator") 
    if tag ~= nil then 
        if tag.Value ~= nil then 
local Leaderstats = tag.Value:findFirstChild("leaderstats") 
            if Leaderstats ~= nil then 
Leaderstats.Gold.Value = Leaderstats.Gold.Value + gold
wait(0.1)
script:remove()
            end 
        end 
    end 
end 
Humanoid.Died:connect(PwntX_X) 

This script is the damage script in the handle of the weapon used to kill the victim. If you know how to write it so it connects with the gold/exp script I would be very grateful.

dmg = script.dmg.Value

function touch(hit)
local   humanoid = hit.Parent:FindFirstChild("Humanoid")
    hit.Parent:FindFirstChild("Humanoid").Health = hit.Parent:FindFirstChild("Humanoid").Health - dmg
  script.Disabled = true
end

script.Parent.Touched:connect(touch)

And the following script is something I got from the roblox paintball gun paintball script. I tried putting it inside the damage script and it didn't work.

function tagHumanoid(humanoid)
    -- todo: make tag expire
    local tag = script.Parent:findFirstChild("creator")
    if tag ~= nil then
        local new_tag = tag:clone()
        new_tag.Parent = humanoid
    end
end


function untagHumanoid(humanoid)
    if humanoid ~= nil then
        local tag = humanoid:findFirstChild("creator")
        if tag ~= nil then
            tag.Parent = nil
        end
    end
end