(PORT HURON TOWNSHIP) -- A Michigan State Police Forensic Artist has drawn a sketch of the woman found Tuesday behind the Goodwill store in Port Huron Township. Authorities say surveillance video from the store showed the woman had been there since at least March 3rd. She was concealed by snow and blankets that covered her body. An autopsy performed determined the woman is white, approximately 80-years old, about 5-feet tall and about 100-110 pounds. She has gray shoulder length hair, dark eyes, had a mastectomy and there are two surgical scars on her stomach. She was wearing an Indian print type skirt and blouse that was white, black and red in color. At this time, the cause and manner of her death is undetermined. Anyone with information is asked to contact Detective Eric Stevens at 810-987-1726.