Cloning something into the playerGUI?

I have a ScreenGUI (named: StartingScreen) located in workspace. I need help, I don't want this ScreenGUI to be on the screen when a player dies but if it they just joined the game I do want them to see it. I just need to know how would I make a script that clones something from the Workspace into the playergui if they joined the game but only do this once?