New revelations on the Zodiac killer

After 40 years of silence,? a former California Highway Patrol officer says he knows the identity of the alleged Zodiac killer.

Lyndon Lafferty, 79, claims 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 suspect.

[More photos:? Images from the Zodiac Killer investigations]

The Zodiac killer is named for the symbols used as a signature? in coded messages to the police. The killer claimed to murder 37 around the San Francisco Bay Area in the late 1960s and early 1970s, but police only linked the suspect to five murders.

In his book, "The Zodiac Killer Cover-up," Lafferty says the suspect's rage was driven by an adulterous wife. According to Lafferty, the case was covered up by law enforcement agencies and a unnamed judge who Lafferty says was having an affair with the suspect's wife.

"The police departments in general were acting under the authority of the Solano County Sheriff, so they were instructed you do not investigate this man until you have permission from the judge," Lafferty told ABC News. "I am the only person who can testify under oath that these things were absolutely true. My satisfaction is telling my story as it happened."

Lafferty says he met the Zodiac Killer while working as a CHP officer in 1970. Lafferty spent the next 30 years tailing the suspect and gathering evidence with six other investigators.? In 2002, he began compiling his notes for the book.

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