Deceased immediate cause of death is Facial and Nasal bone fracture &
aspiration of blood.  Interval between onset and death is 5 minutes.

There have been two Medical Examiner certificates issued for this death.  
On the first M.E.'s certificate this death was categorized as
suspicious and blunt force trauma was listed on the M.E.'s report. 
The second (amended)Examiner's Certificate labelled the death as
accidental (from a fall) and was filled some 20 days after the man
died.

No secondary cause of death was listed.  Underlying cause:  coronary
artery athersclerosis.
Can the forensic literature characterize this death for me in layman's
terms? For example, to what degree is it possible to suffer the above
injuries from a STANDING fall (ie., the person did not fall from any
height.  Did this individual suffocate on his own blood?  Was he
likely unconscious at the time?

Suppose someone was with the deceased shortly before the death? 
Suppose the room was ranshacked?  Suppose this occurred at 1am and the
front door was left wide open?  Suppose there were other suspicious
activity on the scene...

Approximately what would it cost for a professional to review the
entire file (the Medical Examiner report and the police report from
the scene) to see if he/she concurs with the findings?

Who signed the death certificate?  Is it the county coroner or the
patient's regular MD?  In general, the cause of death is "assumed"
unless the police or the coroner's office suspects foul play.  In the
absence of any foul play, the body is turned over to the morgue or any
funeral home, which then proceeds to obtain a "signature" from the
patient's primary care MD.  The primary MD usually does not get to see
any written reports, but signs it over based on verbal request from
the funeral home.  Unless the patient was suffering from known cancer
or other terminal illness (kidney failure, stroke, etc.), the most
likely cause of death would be coronary disease (coronary
atherosclerosis) resulting in a heart attack.  If there is no primary
MD available, then the coroner's office will sign it without
performing an autopsy.  I am not sure why this person has 2
certificates signed, however.

The death certificate was signed by the Medical Examiner.  This was an
unattended death.  The deceased was not under the care of a physician
for a presenting health concern.  The autopsy was ordered by the State
regardless of family consent.  There was no involvement by a primary
M.D.

The scene at the time of death was indeed suspicious, as outlined in
my initial question.

If, indeed, the cause of death were a heart attack, here is my
essential question -- Can an individual sustain nasal and facial
fractures (labelled blunt force trauma on the first report) from a
standing fall, such as in a heart attack?

If autopsy was performed and heart attack was confirmed, then I would
say the death was due to that.  I think you can conceivably sustain
nasal and facial fractures from a standing fall.  The coroner would
have found evidence of brain trauma if death resulted from the blunt
trauma.  In the latter case, you would not expect to find any dead
heart tissue.