Elisabeth Harnois, who co-starred on CBS’ Miami Trauma, will be joining the cast of another CBS/Jerry Bruckheimer drama as a regular, the mothership CSI series. She was originally signed to guest star in the May 5 episode as the estranged daughter of Conrad Ecklie (Marc Vann) who works for the Los Angeles Police Department and helps the Las Vegas crew hunt down serial killer Nate Haskell (Bill Irwin). The guest stint grew into a bigger role on the show. She was expected to return for more episodes and has now been upgraded to a full-blown regular status on the show. Veteran CSI, now in its 11th season, has not been officially renewed for next season but that is considered a foregone conclusion. Harnois, whose series credits also include Point Pleasant, Dirt and One Tree Hill, recently starred in the Disney movie Mars Needs Moms and will next be seen in Riddle opposite Val Kilmer. She’s with WME and Schachter Entertainment.
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Elisabeth Harnois is to make a guest appearance in a forthcoming episode of CSI.

Entertainment Weekly reports that the actress will play the estranged daughter of Conrad Ecklie (Marc Vann) in ‘Cell and Goodbye’.

The character, who is expected to recur next season, works for the LAPD and will help the CSI team hunt down serial killer Nate Haskell (Bill Irwin).

Harnois previously starred in short-lived CBS drama Miami Medical and has also appeared in episodes of 90210, Without a Trace and One Tree Hill.

It was recently confirmed that former Lost actress L. Scott Caldwell will appear in the CSI season finale as Langston’s former mother-in-law, who becomes involved in the Haskell investigation.

CSI continues on Thursdays at 9/8c on CBS. Harnois’s appearance will air on May 5.