At one time he spent 18 months doing deep undercover work.
Years later, Morgan's past would come back to haunt him when he was arrested by the Chicago Police Department for the murder of the unidentified boy and two others.
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He is a Supervisory Special Agent of the FBI's Behavioral Analysis Unit, (although has served as interim unit chief for Aaron Hotchner), and has appeared from the series' pilot episode "Extreme Aggressor", which was originally broadcast on September 22, 2005.
Before he left in season 11, he was one of only three main characters to appear since the first season as "starring", while also becoming the only character to appear in all episodes.