Season 9, Episode 14: "The Strongbox"

Both of us have to turn our keys.

Well, then I am gonna have to ask you to turn your key.

I'm sorry, George. I can't do that.

Turn your key, Maura. Turn your key.

So how is a guy like you not involved?

I might ask you the same thing.

That's true. Maybe he's not married.

Oh, that is so sweet.