Miss O’Callaghan was found dead near Uffington, Oxfordshire A taxi driver is due in court later charged with the murder of 22-year-old Sian O’Callaghan.
Christopher Halliwell, 47, will appear before Swindon magistrates accused of killing Miss O’Callaghan, whose body was found near Uffington, Oxfordshire.
She had not been seen since leaving a nightclub in Swindon early on Saturday 19 March.
Mr Halliwell, of Ashbury Avenue, Swindon, was charged with the crime while in custody on Saturday evening.
Police said bones recovered during a search in Gloucestershire were believed to be of another woman estimated to be aged between 23 and 30.
Officers carried out a dig at Baxter’s Farm at Eastleach in the Gloucestershire Cotswolds, 17 miles from where Miss O’Callaghan’s body was discovered.
Det Supt Steve Fulcher of Wiltshire Police, who is leading the investigation, said forensic laboratory tests and a post-mortem examination would be carried out on the bones.
He said it had been indicated to him that the woman was taken from the Swindon area between 2003 and 2005.
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