Removing function after player's death?

I KNOW KEYDOWN IS DEPRECATED!!!

Alright, after more help I could do it and do my script. Now, I'd like to make the script work again when the caster or the objective dies. If you are new and you haven't seen my old question that's what I've done thanks to this great community:

-Choosing a player with Mouse -Pressing Z -Deactivating a script located in their playergui

And that's done with the following script:

local players = game:GetService("Players")
local mouse = game.Players.LocalPlayer:GetMouse()
local advertisement = game.Players.LocalPlayer.PlayerGui.Erasure:WaitForChild("Advertisement")
local nome = ""

mouse.KeyDown:connect(function(k)
k = k:lower()
if k == 'z' then
        --This makes appear a textlabel that says his script has been deactivated
	if game.Players.LocalPlayer.Backpack.ErasedValue.Value == "true" then
		local target = mouse.Target
	    local humanoid = target.Parent:FindFirstChild("Humanoid")
	    if humanoid then
	    local character = humanoid.Parent
	    local nomeplayer = players:GetPlayerFromCharacter(character)
	    local nome = humanoid
	
		advertisement.Visible = true
		advertisement.TextLabel.BackgroundTransparency = 0.2
		advertisement.TextLabel.TextTransparency = 0.2
		wait(0.7)
		advertisement.Visible = true
		advertisement.TextLabel.BackgroundTransparency = 0.4
		advertisement.TextLabel.TextTransparency = 0.4
		wait(0.7)
        advertisement.TextLabel.BackgroundTransparency = 0.6
		advertisement.TextLabel.TextTransparency = 0.6
		wait(0.7)
		advertisement.TextLabel.BackgroundTransparency = 0.8
		advertisement.TextLabel.TextTransparency = 0.8
		wait(0.7)
		advertisement.TextLabel.BackgroundTransparency = 1
		advertisement.TextLabel.TextTransparency = 1
		wait(0.7)
		advertisement.Visible = false
		
               --That's the new thing, it didn't work though. Help, please?
		if nome.Health >= 0 then
			nomeplayer.Backpack.ErasedValue.Value = "false"
		elseif game.Players.LocalPlayer.Character.Humanoid.Health >= 0 then
			nomeplayer.Backpack.ErasedValue.Value = "false"
		end
		end
		
	else
    --This deactivates other people's script.
    local target = mouse.Target
	local humanoid = target.Parent:FindFirstChild("Humanoid")
	if humanoid then
		local character = humanoid.Parent
		local nomeplayer = players:GetPlayerFromCharacter(character)
		local nome = nomeplayer
        if nomeplayer.Backpack.ErasedValue.Value == "false" then
	      nomeplayer.Backpack.ErasedValue.Value = "true"
        end
	end
	end
end
end
end)

I count on you this time too! Thanks for your help.

###This won't work because you’re trying to modify objects inside another player’s Backpack. You can’t modify another client's PlayerGui, PlayerScripts, or Backpack from a LocalScript. You’ll need a RemoteEvent to access it.