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CSI Finale Exclusive: Treat Williams Cast as a Pioneer in Crime Scene Investigation

Treat Williams CSI FinaleCSI will get a blast from forensics science’s past when TV vet Treat Williams guest-stars in the CBS drama’s the Season 14 finale.

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In this season’s final hour, currently slated to air May 7, the Everwood alum will play Sam, someone who as a Sheriff’s Deputy back in the late 1980s demonstrated a knack for invention and an aptitude for forensic science. As such, he pioneered methods of crime scene investigating in ways that put him decades ahead of his time.

The finale’s Case of the Week finds Sam in present day, when an old case involving the killing of a 12-year-old resurfaces and he is drawn back into the investigation.

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Since his run as Everwood‘s Dr. “Andy” Brown, Williams’ more recent TV credits include Chicago Fire, Hawaii Five-0, White Collar and Leverage.