MODESTO, Calif. (AP) - Laci Peterson's parents spoke longingly of their daughter but would not publicly speak the name of her husband, the man accused of killing her and their unborn son.

Scott Peterson pleaded innocent to murder charges Monday. Hours later, Laci Peterson's anguished mother broke the public silence she has maintained since the two bodies were found last week on a San Francisco Bay shoreline.

''I can only hope that the sound of Laci's voice, begging for her life, begging for the life of her unborn child, is heard over and over and over again in the mind of that person every day for the rest of his life,'' Sharon Rocha said.

Scott Peterson, 30, is being held without bail on charges he acted ''intentionally, deliberately and with premeditation'' in killing Laci Peterson, 27. She was nearly eight months pregnant when she disappeared.

Hours before, Scott Peterson's name was read in a Stanislaus County courtroom during a brief but emotional appearance where he was charged with two counts of murder. The charges against Peterson include the special circumstance that he allegedly committed multiple homicides, which would let prosecutors seek the death penalty.

Documents filed Monday by prosecutors said the killings happened at the Petersons' Modesto home on Dec. 23 or Dec. 24.

The two corpses washed ashore last week about three miles from where Peterson said he was fishing in San Francisco Bay on Christmas Eve when his wife vanished.