CSI “If I Had A Hammer” Season 9 Episode 21

CSI Season 9 Episode 21 “If I Had A Hammer”: Watch a sneak peek of this new episode airing this Thursday April 23 at 9pm on CBS.

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Episode Synopsis: CSI “If I Had A Hammer” Season 9 Episode 21 – Catherine revisits one of the very first cases she worked as a CSI when the convicted felon in the murder (guest star Henry Thomas) claims the verdict was based on faulty evidence, on CSI: CRIME SCENE INVESTIGATION, Thursday, April 23 (9:00-10:01 PM, ET/PT) on the CBS Television Network.