DUNCAN, Okla. (AP) – Authorities in Oklahoma say the investigation into a fatal shooting outside a Walmart is preliminary, but insist it was an “isolated incident.” Stephens County District Attorney Jason Hicks said during a press conference that there was never an active shooter Monday inside the Walmart in Duncan. The shooting in the parking lot left three dead, including the shooter. Police Chief Danny Ford says the shooter shot a man and woman then turned then gun on himself. All three died at the scene. (Photo: CNN)