May 8, 2003 9:45 a.m. Our southern neighbor is a haven for murderers. Teri March observed an anniversary last week, but it was not one to be celebrated. One year ago last Tuesday her husband David, a Los Angeles County deputy sheriff, kissed her goodbye and left for work, making the long drive from their home in Saugus, California to the Temple City sheriff's station. It was the last time she would see him alive. At about 10:40 that morning, Deputy March was patrolling alone in Irwindale, a desolate area of rock quarries and gravel pits 20 miles or so...