The Zodiac Killer murders his first two officially confirmed victims, David Arthur Faraday and Betty Lou Jensen, on Lake Herman Road in Benicia, California, United States.

The Zodiac Killer is the pseudonym of an unidentified serial killer who murdered five known victims in the San Francisco Bay Area between December 1968 and October 1969. The case has been described as "arguably the most famous unsolved murder case in American history," and has become both a fixture of popular culture and a focus for efforts by amateur detectives.

Benicia is a city in Solano County, California, located on the north bank of the Carquinez Strait in the North Bay region of the San Francisco Bay Area. It served as the capital of California for nearly thirteen months from 1853 to 1854. The population was 27,131 at the 2020 United States census. Benicia is just east of Vallejo and across the strait from Martinez.

December 20 is the 354th day of the year in the Gregorian calendar; 11 days remain until the end of the year.