The CSI team investigates the death of a woman full of alcohol and drugs in a pool at a rehab facility. (TV-14 V)
Frustration mounts for the CSI team as another victim surfaces and all evidence points to the Gig Harbor Killer. Guest stars include Mark-Paul Gosselaar as twins Jared Briscoe and Paul Winthrop, Mark Valley as Detective Daniel Shaw and Patricia Arquette as Avery Ryan. (TV-14 L, V)
Morgan, Sidle and Finlay try to relax at a forensics conference when a mass shooting occurs on site. (TV-14 D, V)
The CSI team suspects foul play when a chemistry teacher's science experiment goes horribly wrong. Guest stars include Marissa Jaret Winokur as Principal Dawn Meadows, Skipp Sudduth as Ed Lusk and Bella Thorne as Hannah Hunt, a student. (TV-14 V)
Sara and Greg are quarantined after responding to a crime scene that's contaminated with a deadly pathogen. (TV-14 V)
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