Criminal Minds, Season 3

Hotch:
Fire, hanging, asphyxiation. Now we've got a drowning.

Reid:
I think it's someone who's afraid of drowning.

Hotch:
What do you mean?

Reid:
Yeah, it hit me when Morgan freaked out when we were stuck in the elevator.

Prentiss:
You got stuck in an elevator?

Morgan:
I freaked?

Reid:
Well, that's not important. Here's what is. If you look at the M.O.s of the victims, what do they all have in common? They could all be classified as anxiety disorders. It's right out of The Diagnostics and Statistical Manual. It lists five subtypes of phobias.

Hotch:
Most of these are environmental and situational.

Reid:
Exactly.

Hotch:
So it's all about fear. These people are being killed by their fears.