On the morning of April 14, 2003, Alena Gonzalez, her sister, and her father were walking their dogs at the Point Isabel dog park. Two of their dogs broke away from them and found something down among the riprap. Alena at first thought it was a dead animal, then discovered it was a human body. The human body was later determined by DNA to be Laci Peterson.
Since Conner did not wash ashore, we know that Scott Peterson did not put a pregnant Laci into the Bay on December 24, 2002. How, then, did Laci get to where she was found? It stretches the imagination too much to believe that Laci just happened to wash ashore on the day after Conner's body was placed on the Richmond Jetty. The logical conclusion is that the two bodies were found on subsequent days because they both were placed to be found.
With Conner, we know that he was placed in the exact location he was found. With Laci, that wasn't necessarily the case. She could have been put into the water at Point Isabel, and allowed to wash ashore. It wouldn't matter where she washed ashore, as anywhere in that general area would incriminate Scott Peterson because of his fishing trip on December 24. The other possibility is that she, too, was placed exactly where she was found.
Evidence collected to date fails to prove conclusively which scenario happened. However, the more likely scenario is that Laci was put into the Hoffman Channel during ebb tide the night of April 12/13, expecting that she would wash ashore nearby. When her body didn't surface with the high tide on the morning of the 13th, Conner was placed on the Jetty so he would be found in a way that would not risk his body also being lost. Then, unexpectedly, Laci did wash ashore on the morning of the 14th.