How would I keep a value on an intvalue after the person dies?

Firstly this is not a request site, it is imperative you try everything first and post your problems here not requests. In future make sure that you research thoroughly, looking at the wiki, free models and other questions, this has been asked many times before. I shouldn't really give you any code at all since you haven't given any code. In order to keep Intvalues after a player dies you have to put it in the player (Game.Players) not the Character. I will only help you on putting an IntValue in the player. Use this script: (This is pretty much directly from the wiki too, you needed no prior experience to do this)

game.Players.PlayerAdded:connect(function(player)
     local leaderstats = Instance.new("Model", player)
     leaderstats.Name = "leaderstats" -- Store all values in a model for organization

     local money = Instance.new("IntValue", leaderstats) --We create a new IntValue as a child of 'leaderstats'
     money.Name = "Class" --this is the name you want the leader-stat to be when it shows up in-game.
     money.Value = 0 --this is the value of money the new player starts out with. To change this, you can add some more code 
 end)

--And to change it you can do:
player.leaderstats.money.Value = 1 -- This will change the value to 1
-- Or simplier
money.Value = 1