Sonia Jackson

The team tries to determine who is poisoning residents of a small town.

Christy is thrilled when Violet tells her she wants to spend more time together and improve their relationship.

After another failed attempt to defeat Red John, Patrick Jane hits rock bottom in a Las Vegas club on the fourth season finale. While the CBI investigates the murder of a John Doe on its own, Jane finds a new lover (guest star Emmanuelle Chriqui) and ends up shooting one of his own.

Walden tries to loosen Zooey up by sharing some of Berta's special brownies.

Stillman asks Rush and Valens to reopen the 1980 case of an 8-year-old boy found buried in a snowdrift.

David and Keith become comfortable with family life; Ruth finds empowerment.