The human remains were found at the Herrick Lake Forest Preserve in 2010.
Officials say the remains were sent to a lab at Louisiana State University for a digital, facial reconstruction. A photo was released that shows what the person may have looked like.
He was a male, possibly of Hispanic or Native American decent, and between 45 and 65-years-old, authorities said.
Anyone with information is asked to contact the DuPage County Sheriff.