I had to watch the last 10 minutes of the last episode to refresh my memory. Basically Roy shot Burgess and left her to die. Upton came to the warehouse and found Voight beating Roy for information about Burgess location. Upton was trying to keep Voight from beating Roy to death, but then Roy got Voight's gun and they struggled. Upton shot & killed Roy to prevent him from killing Voight . Voight buried Roy in a field and encouraged Upton not to tell anyone.
As I see it, Voight would have been in trouble for beating Roy, and Upton shot Roy to keep him from killing Voight. I don't thi