I'm Trying To Create A Vampire Script Where You Regain Health After Killing a Player. What's wrong?

It's for regaining all of your health when you kill a player, I need to know why it's not working.

Players = game:GetService("Players") -- In case someone renames Players or something
Players.PlayerAdded:connect(function(Player) -- When someone joins
    --// You can add other stuff here, too.
    Player.CharacterAdded:connect(function(Character) -- When they respawn (Get a new Character)
        local Humanoid = Character:WaitForChild("Humanoid") -- Find Humanoid
        Humanoid.Died:connect(function() -- Detects for when the Humanoid dies
            if Humanoid:FindFirstChild("creator") ~= nil then -- Checks for a Killed
                local Killer = Humanoid.creator.Value -- Gets Killer
                local player = game.Players.LocalPlayer -- Gets the player
					local char = player.Character --Gets the player's character
						char.Humanoid.MaxHealth = 100 --Sets the MaxHealth of the Humanoid to 100
						char.Humanoid.Health = 100 --Sets the health to 100, so that the player is at full HP)
            end -- Ends the if
            -- For the Dead guy, you can do stuff to him here.
        end)
    end)
end) -- Another End w/ a Bracket

You cannot access localplayer from a serverscript, and if you could your script would be changing the person killed's value, fix:

Players = game:GetService("Players") 
Players.PlayerAdded:connect(function(Player)
   
    Player.CharacterAdded:connect(function(Character) 
        local Humanoid = Character:WaitForChild("Humanoid") 
        Humanoid.Died:connect(function() 
            if Humanoid:FindFirstChild("creator") ~= nil then 
                local Killer = Humanoid.creator.Value 
                local killerchar = game.Workspace:FindFirstChild(Killer)
local killerhum = killerchar:FindFirstChild("Humanoid")

if killerhum then
killerhum.Health = 100
end
                       
            end 
            
        end)
    end)
end)