Dig Two Graves

In the 1940s, Deputy Waterhouse and Sheriff Proctor drive to a nearby quarry with two bodies stowed in the back of their truck. Waterhouse takes an ornate necklace off one of the bodies and they dump the two corpses over the edge and into the water. As the Sheriff walks away, Waterhouse holds him at gunpoint and demands he get rid of his badge, telling Proctor that he's no longer fit to be sheriff. Proctor throws his badge over the cliff. Read more on Wikipedia.