A Bronx mom whose body was found over the weekend had been sliced in the throat, and her death has been ruled a homicide, the city Medical Examiner’s Office said Monday.

Joan Viau was found face-down in a wooded area of Washington Heights on Saturday afternoon, three days after she was reported missing.

Before the gruesome discovery, police were questioning the 52-year-old woman’s son, Joseph Garcia, and arrested him for using his mom’s credit card while she was missing.

Viau was last seen by her boyfriend outside her home on Carlisle Place in Olinville around 1 p.m. last Monday, just before she left for an unspecified treatment at a Veterans Affairs hospital on Kingsbridge Road.

Cops discovered blood spattered inside Viau’s car Wednesday and the next day in her home.