Matt Lauria

Matt Lauria and Annabeth Gish have booked recurring roles on CSI, TVGuide.com has confirmed.

Gish will play Laura, an old friend who Catherine (Marg Helgenberger) hasn't seen in 22 years. And as we previously reported, this friend is hiding a shocking secret.

Meanwhile, Lauria will play Sac Pratt, a young, arrogant FBI agent who assists on one of the CSI team's cases, much to the chagrin of Catherine and D.B. Russell (Ted Danson). But despite some feather-ruffling, Pratt and Russell ultimately come to a place of mutual respect.

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Lauria (Friday Night Lights) and Gish (Pretty Little Liars) will first appear during November sweeps.

CSI airs Wednesdays at 10/9c on CBS.