Authorities plan to release test results and update the investigation into the 1971 disappearance of two girls near Alcester.
The attorney general, sheriffs from Union and Clay counties, and the Union County state's attorney scheduled a news conference Tuesday in Elk Point.
They'll discuss results of forensic testing on human remains found last September in an upside down Studebaker pulled from a creek.
Cheryl Miller and Pamella Jackson, of Vermillion, were last seen in the car on their way to a party at a nearby gravel pit.
Attorney General Marty Jackley earlier said a mechanical test points away from foul play because the car was in third gear, the highest.
A forensic pathologist confirmed skeletal remains found in the car are consistent with being from two different people.
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