Reid and Prentiss in “Unfinished Business”

Reid

To get away with murder, you simply don't tell anyone.

Prentiss

The only people he told were the people he killed. And then he took from them what he needed: cash, credit cards...

Reid

I'm going to call Garcia and see if anything Catherine Hale owned was used after her death. [dials phone]

Prentiss

[to herself] And then he moved on to his next victim.