A man working on an oil rig in western North Dakota was crushed by a tank and killed. Thirty-one-year-old Karl Heller died when a tank that was being moved fell and crushed him. US federal safety authorities are investigating. Counterweight Strikes and Kills Oilfield Worker Worker A 35-year-old man was killed in a workplace accident at a Montana oil field. Kory A. Dawson was attempting to service a pumping unit when he was hit by the counterweight. The victim was taken by helicopter to hospital, where he was pronounced dead the same day. The field is operated by Great Plains Operating LLC, […]