Catherine, Riley and others in “Art Imitates Life”

Catherine

Lividity says the victims died in the positions in which they were discovered.

Riley

So, what does that mean? That the killer's using some sort of gas chamber?

Grissom

I think so. He lures someone back to his place, slips them a sedative, then re-dresses and positions the bodies inside a sealed container, waits for the carbon monoxide to go to work. Once the bodies are in full rigor, he's got about ten hours to place them and have them discovered.

Nick

Now that we know the recipe, let's find the cook.