2. When he confronted his childhood abuser
When Derek was a child, he spent a lot of time at the Chicago Youth Center where Carl Buford, the owner of the center, began sexually abusing him. After returning to Chicago as an adult, being charged with murder, and finding out that Buford was still assaulting young men, Morgan came clean to his team.
"Profiler, Profiled" (Season 2, Episode 12)