A midshipman left the Naval Academy for keeping silent after a classmate confided she once helped commit murder. Jay Guild submitted a letter of resignation and moved off the campus, said academy spokeswoman Karen Myers. Guild, 18, had told the Fort Worth Star-Telegram in Texas he was quitting rather than face dismissal for violating the honor code. Academy spokesman Scott Allen would not say what disciplinary action Guild would have faced, saying his resignation made the question moot. Guild resigned because of classmate Diane Zamora, 18, who was arrested last week at her Fort Worth home and charged with the murder of Adrianne Jones, a rival for her boyfriend's affections. Allen said the academy was processing the paperwork to oust Zamora. Guild said Zamora first mentioned the killing during plebe summer, the training session for first-year midshipmen that begins in July.