S1·E17 Simple Man

Shortly before Horatio is set to testify at a high-profile murder case in which the defendant is the husband of a city councilwoman, he's given new facts that could prove the man is innocent. The information revolves around the discovery of a second victim who matches the profile of the first one and was killed in a similar manner. If the man on trial isn't guilty, then Horatio fears that a serial killer may be on the loose.