What is the significance of haunting in "I heard a Fly buzz--when I died" and "One need not be a chamber"?

Emily Dickinson had a way within her poetry to convey
information, and also provide more questions than
answers.

In the poem, "I heard a Fly buzz—when I died,"
there is a great deal of speculation with regard to the presence and meaning of the fly
at such a moment. As the speaker explains that all is in place in preparation for her
death—personal possessions have been bequeathed, soon-to-be mourners have cried their
eyes dry and now only wait, and the subject of the poem prepares for a final breath and
the revelation of life after death ("when the king /  Be witnessed in his power"), a
ordinary fly finds its way into the room.

Some interpreters
find this element in the poem horrifying and fearful, suggesting that the fly is
symbolic of something terrible, of the physical side of death (decay), or that it is
symbolic of Satan present at this moment between life and
death.

For me, the fly signifies that life goes on; that
the natural world will not note the passing of the woman, and that in her final moments,
nothing of import in the world can be of concern to her.

In
terms of the haunting in this poem, perhaps it is present as we try to understand how
someone dying could possibly write the poem, as if the ending of her life would be
recorded, along with her last thoughts, after her death. Wouldn't
the speaker be dead to utter the last words of the
poem?

With
blue, uncertain, stumbling buzz,
Between the light and me;
And then
the windows failed, and then
I could not see to
see.

At the CUNY/Brooklyn
site, possible interpretations are suggested:

readability="11">

For literal-minded readers, a dead narrator
speaking about her death presents a problem, perhaps an unsurmountable problem. How can
a dead woman be speaking? Less literal readers may face appalling possibilities. If the
dead woman can still speak, does this mean that dying is perpetual and continuous? Or is
immortality a state of consciousness in an eternal
present?

My question looks at
the idea of the dead woman still speaking, and in this I find the aspect of
"haunting."

"One need not be a Chamber—to be Haunted," also
by Emily Dickinson, compares the sense of being haunted by a house or person with the
contention that haunting is not solely connected to dwellings or even death. In this
poem, the haunting takes place within the individual: past actions, death, guilt cause
the person in question to be haunted by these things during life, making their way not
through the empty halls of a castle, but the long corridors of the
mind.

Dictionary.com defines "haunting"
as:

remaining
in the consciousness; not quickly
forgotten

With this
description in mind, we can see how haunting may take place within one's self, perhaps
even as the result of the life choices of that self—barring
death.

The
Brain has Corridors -- surpassing

Material Place
--

The speaker says that
rather than facing the "Cooler Host" that resides within us, it would be
easier to meet just a simple ghost;
or...

This
madrigal is the form of fear, in assassins,
ghouls, and even perhaps a hint of vampires
(“through an Abbey gallop,” it speaks of fleeing to a church for protection). The
constant theme of fear is well put, for all things of which they speak are
beyond your control: assassins, ghosts, vampires,
and most importantly, your
mind.

In
terms of the concept of haunting, it can come from the outside, or we may welcome it
within the secret recesses of our minds as it fills us with fear that we create
ourselves.