A fisherman finds two dead bodies on Longmire this week, which leads to a case that involves pot grown on both the reservation and outside the reservation.
Walt eventually determines that the pot grower is a park ranger who recently served time in Afghanistan. He shot a member of the Mexican cartel, who had shot a member of the Cheyenne. He then tied the bodies together to make it appear as if the Mexican cartel killed both boys.
We also learned that Walt's wife died of cancer.