Part 5 of The Trial of Robert Durst: Greatest Hits is Season 1 Episode 5: The Killing of Morris Black.
It was early 2001. After Susan Berman's murder, Robert Durst lives in a boarding house in Galveston, Texas, disguised as a mute woman, and befriends a new neighbor named Maurice Black. Deputy John Lewin uses interview clips of Durst and others to chronicle the events that would lead to the murder of Morris Black that September.