An employee with the Platte County Public Works Department died Monday afternoon after being hit by an unoccupied truck.. The highway patrol says Justin Hartman, 30, of Dearborn, Mo., was killed after he was struck by a vehicle that rolled down a hill, pushing him in to an excavator. According to the Platte County Sheriff’s Department, the employee was trimming trees at the intersection of 77th Street and John Anders Road in southern Platte County.