Morgan is arrested as a serial killer and the BAU tries to prove his
innocence. At the end we find out the murders were committed by
another person from his past, Morgan's mentor Carl Buford.
He confronts Buford, a pedophile who molested
Derek and other teenage boys from the youth center he ran.
The murders were committed to hide his sexual crimes.
Even more loathsome than Rodney Harris was Julius Tennon,
as Carl Buford. Nothing like his vile alter ego, Tennon is married
to actress Viola Davis. They have three children.