Another week, another person crawling out of the shadows of anonymity to claim intimate knowledge of San Francisco’s Zodiac killings. In fact, the flavour of the last ten years has been to implicate a deceased family member. It’s easier that way. You don’t get community service for wasting police time, and uncle Mike who dropped his trousers in your parent’s garage gets to be the bad guy for once. Drop in a couple of unsolved sexual assaults and the guy’s feathers start to look real tarnished.