The Will County coroner has said the person was dead for several months or more. Results of an autopsy last week were inconclusive.
Authorities say an investigation into the corpse's identity is ongoing. The rib cage, spinal column and partial left and right femur bones were found.
Stacy Peterson's husband, /*Drew Peterson*/, is scheduled to appear in court Thursday on charges he killed his third wife, Kathleen Savio, in 2004.
Savio's death, originally ruled an accidental drowning, was reclassified as a homicide after her body was exhumed and an autopsy conducted following Stacy Peterson's disappearance in October 2007.
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