A Placer County judge has postponed until August a preliminary hearing for a woman and her son accused of killing her two daughters nearly a decade ago.

Theresa Jimmie Knorr, 48, and William Knorr, 26, had been scheduled for the hearing on June 14, but Municipal Court Judge Joseph O'Flaherty on Thursday granted a prosecution request to move that to Aug. 16.Deputy District Attorney Roland Iversen said he expects a second brother, Robert Knorr, 25, to be extradited from Nevada by then and be included in the hearing.

Theresa Knorr and her sons are accused of multiple murder and conspiracy in the deaths of Suesan Knorr, 17, and Sheila Sanders, 20.

They were arrested after a surviving sister, Theresa Groves, 23, of Salt Lake City told Placer County sheriff's detectives that her mother, with help from the two sons, had killed two sisters and dumped their bodies in areas near Squaw Valley and Truckee.

Suesan Knorr, 17, was found burned to death on July 17, 1984, alongside Squaw Creek in Placer County. The body of Sheila Sanders, 20, was discovered on June 21, 1985, in a box left next to Mardis Creek Campground in Nevada County.

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Robert Knorr is serving time in Ely State Prison in Nevada for an unrelated homicide. A Nevada judge on Wednesday denied a writ alleging that Knorr was improperly charged as an adult in California and that Placer County lacked territorial jurisdiction because the crimes were committed in Sacramento County.

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