A sexual sadist, his pleasure was torture and murder. His first victims were a teenage couple, stalked and shot dead in a lover's lane. After another slaying, he sent his first mocking note to authorities, promising he would kill again. The official tally of his victims was six. The real toll may have reached fifty. Hey was never caught. Robert Graysmith was on the staff of the San Francisco Chronicle in 1969 when the killer's first letter arrived.