There is someone in this room who knows more about the murder than he is telling.
Murder?
What was that you said?
I said "murder".
What murder?
I-I-I don't know, y-you said "murder".
I said murder? *You* said murder!
No, I said murder because *You* said murder.
*I* said murder?
You said there is someone in this room who knows more about the murder than he is telling.