A man was killed in a single-vehicle accident in Loudon County last night. Troopers say a 2017 Toyota Avalon driven by 59-year-old Gregory D. McGraw of Knoxville ran off Buttermilk Road near Hope Creek Road, struck a guardrail, kept going and hit several trees. McGraw, who according to the accident report was not wearing his seat belt, was partially ejected through the passenger’s side window.