SIOUX FALLS, S.D. (AP) — A Sioux Falls woman charged with murder in the 1981 death of her newborn has been released from jail.

The Argus Leader reports Theresa Bentaas posted bond Monday. The 57-year-old Bentaas has been in the Minnehaha County Jail since her arrest March 8. She is charged with first- and second-degree murder and first-degree manslaughter in the death of her baby, who was left in a ditch.

Police said they used DNA and genealogy sites to determine she was the mother of the infant, called Baby Andrew. The child died of exposure.

Last month a judge changed a $250,000 cash-only bond to a surety bond, which allows defendants a chance to work with a bail bondsman to be released while their case is pending.

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