A Caldwell County woman was killed Friday night in an accident near the Watauga line.   The 9:20pm accident occurred on Shuffletown Road in the Buffalo Cove area of Caldwell and claimed the life of 45-year old Melissa Ann Greer.  The Oak Hill woman was thrown from her vehicle as it ran off of the road and overturned.  The State Patrol says she was not wearing her seatbelt .