A death investigation is under way in Ballard County after a man was killed in a two-vehicle collision near Wickliffe, Kentucky. Kentucky State Police says the crash happened on US 51, about a half-mile south of Wickliffe Wednesday night. Police say 50-year-old Charles Oliver, of Charleston was traveling northbound when he crossed over the center line and traveled under the trailer portion of an oncoming semi. 40-year-old Michael Skees, of Fredonia, Kentucky was driving the semi and traveling southbound. He was not injured. The Ballard County Coroner says Oliver died at the scene. He was not wearing a seatbelt. An autopsy has been scheduled and the crash remains under investigation.