It would appear that CBS 13 decided to refresh their evening news program, replacing co-anchors Paul Joncich and Jennifer Whitney are.
On February 1, 2006, KOVR CBS 13 debuted its news cast boasting a new graphic, new music, a new set, and a new anchor team consisting of Sam Shane, who previously worked on MSNBC and KCRA, and Pallas Hup.
Perhaps this article will shed some light, although Askipedia does not necessarily endorse the thoughts expressed in this article.
http://sacrag.com/2006/04/the-real-story-of-paul-and-jen-dedicated-to-rontopofit
It's more likly that this is where Paul Joncich is:
http://www.actionnewsnow.com/Global/story.asp?S=5377026&nav=menu68_8_1