The shooting script of "Fire Walk With Me" contains a
scene in FBI headquarters with Cooper standing in an office
doorway conversing with Diane, implying she is some sort of
office administrator or secretary. (The scene is written
such that the audience never sees nor hears Diane.)
During the first season, Carol Lynley ("The Poseidon Adventure") had been signed
to play Diane in the second season, but this never happened.
From the scene in "Fire Walk With Me", we can assume that Lynch wanted to
maintain the air of mystery about her, so that she might be heard but
never seen.
Before this was revealed, however, many viewers speculated
that Diane was: an "alter ego" of Cooper's, his wife, or his
name for the tape recorder.
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