Sounds of Silence
S1 episode 20 Aired on April 19, 2001

Vehicular manslaughter or murder? The battered body of the deaf man tells the CSI team members a troubling story, and in the course of their investigation, the evidence not only leads them to those responsible for the young man’s death, but also reveals surprising information about Grissom’s personal life. Meanwhile, Catherine and Nick deal with the carnage of a coffee shop massacre.