There is a certain episode I only know the last scene of! Can someone give me the name of the episode?

What is the name of the C.S.I. (Las Vegas) episode in which the last scene looks like Grissom in a guest bedroom begging Catherine to stay in the room as he lies there and then the door closes??? I saw this the other день and i was dying to know the name of the episode. Can Ты help?! Thanks so much. ~PianoWizzy, new C.S.I. fan