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Say Uncle is the sixth episode of the ninth season of CSI, and the one-hundred eighty eighth episode overall.
Starring: William L. Petersen (Gilbert "Gil" Grissom), Marg Helgenberger (Catherine Willows), Gary Dourdan (Warrick Brown), George Eads (Nicholas "Nick" Stokes), Eric Szmanda (Gregory "Greg" Sanders), Robert David Hall (Dr. Albert "Al" Robbins), Wallace Langham (David Hodges), Lauren Lee Smith (Riley Adams), Paul Guilfoyle (Capt. James "Jim" Brass)
- Detective Chris Cavaliere returns to the show. When he and Greg investigated the house, Cavaliere began to lift the picture of the killer's family, only to see a string attached to it. When he instantly realizes it and tries to tell Greg to watch out, the wall exploded and Cavaliere suffered minor injuries.