This is a story about a photo—an image so horrific we can't print it in NEWSWEEK. The picture shows the lifeless body of an 18-year-old Orange County girl named Nikki Catsouras, who was killed in a devastating car crash on Halloween day in 2006. The accident was so gruesome the coroner wouldn't allow her parents, Christos and Lesli Catsouras, to identify their daughter's body. But because of two California Highway Patrol officers, a digital camera and e-mail users' easy access to the "Forward" button, there are now nine photos of the accident scene, taken just moments after Nikki's death, circulating virally on the Web. In one, her nearly decapitated head is drooping out the shattered window of her father's Porsche.The Web is full of dark images, so perhaps the urge to post these tragic pictures isn't surprising. But for the Catsouras family, the photos are a daily torment. Just days after Nikki's death, her father, a local real-estate agent, clicked open an e-mail that appeared to be...