Season 3, Episode 4: Clyde Bruckman's Final Repose. In what seemed like throwaway dialogue, Scully asks Clyde, a man who can see how people die in the future, what her own demise will look like.

Scully: "Ok. Tell me: How do I die?"

Clyde: "You don't."

This theory has been verified by series producer Frank Spotnitz.