This is the first episode they use Archie as the csi sound tech. He was first introduced in the show while helping the csi team in season two episode two; "chaos theory". He was a security officer for the college where a student had gone missing. Notably in that episode, Archie had seen something while going through security footage which the two investigating CSI's did not see at that time.
Although credited, Gary Dourdan (Warrick) doesn't appear in this episode, although he is mentioned to be working in other cases at the time.
Grissom quotes Shakespeare's Othello. Act V, scene 2: "Yet she must die, else she'll betray more men. Put out the light, and then put out the light."