Where We Left Off With Emily Prentiss On Criminal Minds

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Season 6, Episode 16, "Coda"

Midway through Season 6, Prentiss learned from her former colleague at Interpol that Ian Doyle, a highly dangerous criminal, had escaped from a North Korean prison and was completely off the grid. Eventually Doyle—who Prentiss helped put away by going undercover as his girlfriend—surfaced in D.C. and began killing Emily’s former colleagues.