Longmire:
Season:     1     / Episode:     4    
The Cancer

A fisherman discovers two bodies wrapped and tied together in the river. The sheriff's office investigates and learns that one victim was a local Cheyenne boy and the other was a member of a Mexican drug cartel. The cartel was growing marijuana on reservation land, but Walt discovers that, in this case, a park ranger had been growing the marijuana. The ranger shot the cartel member, who had shot the Cheyenne boy. He then disposed of the bodies in such a way as to make it appear as if the cartel killed both victims. It is also revealed that Walt's wife had earlier died of cancer.