Vincent Duvall

When the CSI team investigates the brutal murder of a family, they trace the killer to the house next door, which might belong to the "Dr. Jekyll" serial killer. Also available on Amazon Instant Video

Langston and Riley are taken hostage during the aftermath of a shootout in an usually calm Las Vegas community. Also available on Amazon Instant Video

The disturbing death of a 3-year-old girl has a great impact on Catherine as she searches for clues to her murder. Also available on Amazon Instant Video

Catherine's testimony in court is not enough to convict a killer suspected of murdering his own mother. Adam Novak, with whom Catherine had a brief romantic encounter, is the lawyer who represents the killer and secures his freedom. As a result, Catherine and Nick leave Las Vegas in order to tie the killer to another crime and put him behind bars for good. Meanwhile, Grissom says goodbye to his colleagues and heads east for a teaching sabbatical. Also available on Amazon Instant Video