The Medical Examiner's office says that the 85-year-old woman was stabbed several times in the neck and torso.
The woman was found by her brother on the floor at around 7:40 a.m. She was lying against a couch and had a towel around her head.
Doctors discovered a puncture wound to the back of her neck.
No arrests were made and there did not immediately appear to be a motive.
There was no sign of forced entry.
A spokeswoman says an investigation is underway as to how the body was reported to their office, and why this was initially thought to be not suspicious.
A full autopsy will be done on Saturday.
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