4. Calvin Shaw
Reid gets to know Calvin Shaw, the inmate who saved him and used to be an FBI agent. He was in jail for killing an informant when it became clear she was not being truthful and had put his fellow agents lives in danger. He offers to help Reid learn how to survive in prison.
That was a close one. #CriminalMinds pic.twitter.com/a7KIyWZvk7
— Criminal Minds (@CrimMinds_CBS) March 2, 2017