Laci Peterson, 27, of Modesto, Calif., was eight months pregnant when her husband reported her missing on Dec. 24. Scott Peterson, 30, was arrested April 18 and is being held without bail on two counts of murder. He could face the death penalty if convicted.
Scott Peterson has acknowledged he was having an affair with a massage therapist, but he insists he never hurt his wife or the baby. His attorneys have suggested the pregnant woman may have been kidnapped and killed by a satanic cult. If there was evidence that the baby might have been born, that could be used to support the theory.
But investigators do not believe Laci was killed by a satanic cult, or that her baby ever lived on its own. "The autopsy in its entirety would not leave as much room for speculation," one source told ABCNEWS.
However, a defense source maintained the tape was tied around the baby's neck, the cut on the body appeared to have been made intentionally and the condition of the child was not consistent with a so-called coffin birth, in which a fetus is expelled from the body of a woman who died while pregnant.
ABCNEWS' Chris Vlasto, Taina Hernandez and Mike Gudgell contributed to this report.