The day before Halloween, 1966, an 18-year-old college student spent the afternoon at her campus library in Riverside, California, but she never made it home. The next morning, her body was discovered in a nearby alley, brutally stabbed and beaten, with her car found disabled just steps away. Who killed Cheri Jo Bates that night, and could her murder be the first known strike of the Zodiac Killer? Or, was it unrelated like Riverside police think - instead the doing of another student? This is the murder of Cheri Jo Bates.

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