Leslie Camilleri, 44, serving a life sentence for the "Bega schoolgirl murders" of two teenage girls in Bega, Australia, in 1997, told police he dumped the body of Prudence Bird at the dump site after kidnapping her near her home in nearby Glenroy in 1992, the Australian Broadcasting Corp. reported Monday.
He has pleaded guilty to killing Bird, but her body was never located.
Camilleri also allegedly told police that on the night he took Bird's body to the dump site,he also scattered the remains of a New South Wales man he had killed, the network said.
Police say they are skeptical of Camileri's admissions, noting several inconsistencies.
Victoria State Supreme Court Justice Elizabeth Curtain ordered additional investigation of his claims for the sake of Bird's mother, ABC said, adding Camilleri was to be sentenced last week in Bird's death, but the sentencing was delayed.