Scott Allen Cooper, the man accused in the shooting death of 17-year-old Garrison Gautreaux in the early morning hours of May 16, had been previously convicted and sentenced for a murder charge. However, a trial error and technicality caused the ruling of the case to be overturned. According to trial transcripts, on the afternoon of Dec. 7, 1997, Cooper and a friend, Vince Moore, approached a vehi…