You can read the actual report here.
The mystery surrounding Terri's condition will continue. The autopsy probably did not have the ability to detect the true answer which much circumstantial evidence points to attempted murder. Because the cause of Terri's condition has eluded conclusive evidence means that the effort to find the truth will continue. I would consider Terri's case similar to what they call a "Cold Case." For that reason, the search for answers will go on.