Last Laugh

Grissom and Catherine investigate the murder of a comic who dropped dead on stage after drinking from a tainted bottle of water. Warrick is sent to a convenience store to investigate the death of a 15-year-old boy only to find out the boy died after drinking the same brand of water. Brass asks Nick and Sara to investigate a case he ruled an accidental death after spotting the 'grieving' husband in a very expensive new car.