The Doctor and River Song : Dialogue - The Angels Take Manhattan

River Song: “It turns out that the person I killed never existed in the first place. Apparently there’s no record of him. It’s almost as if someone’s gone round deleting himself from every database in the universe.”
The Doctor: “You said I got too big.”
River Song: “And now no one’s ever heard of you. Didn’t you used to be somebody?”
The Doctor: “Weren’t you the woman who killed the Doctor?”
River Song: “Doctor Who?”

(Source: doctorwhotv.co.uk)