No I.D. yet on body found in Ill. river

CHICAGO, May 21 (UPI) -- An autopsy on skeletal remains pulled from an Illinois river failed to determine whether they were those of a man or woman, police said Thursday.

Police combed the banks of the Des Plaines River and state police divers searched the water without finding anything to link the remains with Stacy Peterson, the fourth wife of Drew Peterson, who has been charged with killing his third wife, the Chicago Tribune reported. Stacy Peterson disappeared in October 2007.

Investigators hope DNA tests will help identify the remains, but results will not be available for several weeks. They also have been searching for Lisa Stebic, a mother of two from Plainfield who disappeared in April 2007.

Drew Peterson, a former Bolingbrook police sergeant, has pleaded not guilty to killing his third wife, Kathleen Savio, in 2003. He has not been charged in Stacy Peterson's disappearance and has denied any responsibility in that matter as well.

The remains were found Wednesday afternoon near Channabon by Chad Pregracke, founder of Living Lands & Waters, an environmental group in East Moline. He was removing trash from the river using a flat-bottomed work boat when he spotted the skeleton.