What episode of NCIS did Tony's father show up? Did it even happen yet?

I know that Tony's father shows up sometime in season 7, but I've seen every new episode so far and I don't remember seeing him. There was one episode that I didn't get a chance to see all of. But I don't think it had him in it. If it already premiered, please tell me the name of the episode. If not, let me know. Thanks! Bye!