In Calkins v. Boydston, 796 P.2d 452 (Wyo. 1990), the Court held the injured employee must demonstrate his co-employees had actual knowledge of the dangerous condition which caused his injury. Mr. Calkins worked for an oil well service company and was injured when his leg got caught in the unguarded drive shaft of a pump truck. He sued the company secretary-treasurer, Marinell Boydston, and her son Gerald Boydston, the president of the company. The evidence demonstrated Mr. Calkins had used the pump truck in the past and had informed the Boydstons that the pump needed to be replaced. However, he provided no evidence the Boydstons knew the drive shaft was unguarded or the pump was dangerous; therefore, summary judgment was proper.