ANTIOCH, Ill. (AP) – A woman doing landscaping on her suburban Chicago property unearthed the bones of a man who died 800 to 1,000 years ago.

The Lake County News-Sun reports that the woman was digging in Antioch Township near Fox Lake in September when she unearthed some bones. She called authorities when she found a jaw that looked human. The newspaper said the woman didn’t want to be identified.

Crime scene investigators, anthropologists and other experts secured the area and recovered 75 percent of the skeleton of a man of about 20 to 30 years old who died at least 800 years ago.

Bill Brown is a Native American who runs the annual Potawatomi Trails Pow Wow in Zion. He says the man could be from the Ho-chunk or Miami tribes.