CSI Crime Scene Investigation

While Grissom leads a group of college students on a tour of CSI, the dead "speak" while the CSIs investigate, each narrating their own case: a dead casino security guard, a wife who "fell" off a cliff, and a murdered war veteran just back from Iraq.

Following a spray of machine gunfire, the CSI team rises from the chaos. But when one member's life is significantly changed, it proves to be the emotional motivation they need to piece together their lives and ultimately find the shooter.

The case of a cyber killer, who appears to be targeting medical healthcare workers, turns personal when the suspect invokes the name of Mac's father who had died nearly two decades earlier.