Law & Murder

During the trial of a murdered socialite, a juror falls dead from cyanide poisoning. Suspect number one is the defendant of the trial, having an accomplice poison the juror's coffee within the courthouse. But when Castle and Beckett discover that the victim was poisoned long before he reached the courthouse, they begin to follow a trail that involves the victim buying his way into the trial and his connection to the case being presented in the courtroom.