An earlier grisly murder conviction handed down more than two decades ago when he was only 13, has Juan Valdez, 37, now facing the death penalty if found guilty of shooting his long-time girlfriend to death last week in French Camp.Valdez made his first court appearance Tuesday before Superior Court Judge Brett Morgan, in the Stockton Courthouse. However he did not enter a plea in the death of Gloria Castro at their rural home in the 10200 block of South Janet Road. He had told Sheriff’s deputies that the shooting was accidental.In March of 1989 Valdez and a friend Berto Talavera, 15, conspired with Michele Say to kill her 47-year-old father, Ron Say, who objected to his daughter associating with the two boys.