William Zachary Hargraves, age 19 of Clarksville was killed Saturday afternoon, December 6 at a residence off of Highway 164 behind the Clarksville Airport.  Mr. Hargraves was underneath a car, attempting to re-attach a set of springs to the rear when the car slipped off of a jack and fell on him.  Mr. Hargraves was pronounced dead by Coroner Al Davis at approximately 11:00 p.m.