A press conference is underway in Modesto, CA where law enforcement announces that DNA tests confirm the unidentified female who washed ashore earlier this week is in fact Laci Peterson, who has been missing since Christmas Eve. Laci was 8 1/2 months pregnant at the time. The fetus that washed ashore within a day of Laci is the biological child of her and Scott Peterson. The probability is "in the billions."

Scott Peterson has been arrested. He was arrested between 11 and 12 noon, before they got the final DNA results. Law enforcement determined he had to be arrested at that time. He was arrested while driving a vehicle. Sounds to us like they thought he might flee--perhaps through a wiretap and cell phone records, but the police aren't talking about that.

He will be charged Monday or Tuesday in Stanislaus County, CA with capital murder. The special circumstances are a double homicide. No decision has been made as to seeking the death penalty, although it is an option.

Cause of death has not been determined. Laci spoke with her mother at 8:30 am from her home Christmas Eve morning. That was the last contact with her and there have been no sightings of her alive since. Since Scott Peterson is being charged in the county where she lived as opposed to the county where her body was found, it is likely police believe that Laci was killed in or near their home.

We'll be talking about Scott's possible defenses on Fox News Sunday at 2:35, E.T.