How to make an npc monster give items to the player when killed?

i am not completely sure on how to do this. I would need a math.random in it somewhere to make sure it doesnt always give the item when killed right but how would i get the player/character that killed the monster - that would be a objectvalue named creator? however i only know how to do that with a leaderstats with money. how would i give the item to the player

local plr = game.Players.LocalPlayer


script.Parent.Handle.Touched:connect(function(hit)
if hit.Parent.Name == 'DroolingZombie' or 'Zombie' then
    local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
    if plr then
        local tag = Instance.new('ObjectValue',hit.Parent.Humanoid)
        tag.Name = 'creator'
        tag.Value = plr
        wait(3)
        tag:Destroy()
	end
end

end)

this is the code in the sword