Marcus Stanford has pleaded guilty to being an accessory to the murder of Leeton school teacher Stephanie Scott.
ABC News reports, Stanford is the twin brother of Vincent Stanford, who is accused of raping and murdering Ms Scott, 26, in April last year.
Her burnt body was found in the Cocoparra National Park, about 70 kilometres from the town of Leeton, where she worked as a teacher at Leeton High School.
She was killed just days before she was due to marry.
Vincent Stanford, a 25-year-old cleaner at Leeton High School, was arrested four days after her disappearance.
His twin, Marcus Stanford, was arrested in June last year and charged with being an accessory after the fact.
Marcus Stanford is expected to be sentenced in May.
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