(Yahoo!News) – After 40 years of silence, a former California Highway Patrol officer says he knows the identity of the Zodiac killer.

In his book, “The Zodiac Killer Cover-up,” Lyndon Lafferty, 79, says the serial killer is a 91-year-old recovering alcoholic who is living in Fairfield, Calif., outside of Napa Valley. He chooses not to ID the man.

  • Text smaller
  • Text bigger
Note: Read our discussion guidelines before commenting.