I always find it interesting when people in books or movies know something about the victim of a crime or how it was carried out and they struggle with how to get the information to the authorities without being made a suspect. It's pretty simple actually. Call a lawyer, retain him, provide the information, and he'll relay it to the authorities without ever identifying you (assuming he's a real lawyer who intends to remain a lawyer). Why is this route so rarely, if ever, used in fiction?
Kelly
Kelly