Donna Scrivo, 60, was arraigned on first degree murder charges on Monday after the Macomb County Medical Examiner ruled that her son, 32-year-old Ramsay Scrivo, died from asphyxiation and ruled his death a homicide.

Scrivo had previously been charged with disinternment and mutilation of a body and removing a body without medical examiner's permission.

According to authorities, the investigation includes security videos that show Scrivo purchasing a Skilsaw.

Read more: WXYZ-TV