6. Ian Doyle, played by Timothy V. Murphy
Ian Doyle was the nemesis of former agent Emily Prentiss. He was under investigation by Interpol, with Emily having gone undercover to catch him. Doyle found out who she really was and went after her. Eventually, after stabbing Prentiss, her death was staged in order for her to go into hiding. In this scene, Doyle and Prentiss have a tense discussion where he appears to threaten her team.