just to clarify: this CAN be done, it IS done when MORE information is available & presented to the ME!
remember that this case was NOT investigated as an "unattended" death! MM was identified as a practicing physician, on site and gee, he had a "prepared" explanation for her demise! Authorities AT THE TIME gave "professional exemptions" to the powerful personality, MM; probably the modus operandi of MM's entire FAKE life!
UNDETERMINED is NOT a classification that MEs like to use BUT it is a valid manner of death.
IMVHO Dr. Frickie missed a full statement of COD by ignoring the drugs on board, especially the Ambien @ that time of the day!