Bones recovered recently near the site where Laci Peterson's remains were found are from an animal, authorities said Thursday.
A forensic expert analyzed the bones at the Contra Costa County coroner's facility Thursday and determined they were not human, said sheriff's spokesman Jimmy Lee.
A Richmond woman said she discovered the bones "weeks ago" near the spot where Laci Peterson's remains were found along the eastern shore of San Francisco Bay, Richmond police Sgt. Enos Johnson said.
The woman gave the bones to police Monday.
Peterson, 27, was almost eight months pregnant when she was reported missing Christmas Eve. Her body was badly decomposed when a passer-by found it in April at Point Isabel Regional Shoreline, south of Richmond. The body of her unborn son was found near the shoreline about a mile away.
Scott Peterson, 30, has been charged with two counts of murder in the deaths of his wife and son. Prosecutors are seeking the death penalty.
Prevailing winds and tides in the bay regularly bring debris ashore at Point Isabel, a park popular with dog walkers, officials said.
Bee staff writer John Coté can be reached at 578-2394 or firstname.lastname@example.org.