A missing Reisterstown woman's cause of death has been revealed.The Maryland Medical Examiner determined 60-year-old Marcia Ellwood died accidentally by way of drug intoxication, which included a mix of cocaine and fentanyl.Ellwood was reported missing on May 2, one day after leaving her home for work.RELATED: Reisterstown woman found dead day after being reported missingShe never arrived, and no one ever heard from her again.Shortly after issui…