
However, this movie was likely the inspiration for the Zodiac Killer to delve into the newspaper archives and conduct some research into the original film "The Most Dangerous Game" (1932), using tools such as library microfiche. I recreated this possible research and looked for the phrase "man is the most dangerous animal of all" from 1690 to 1969 and found only one result in 1932.

Frederick "Fritz" Joubert Duquesne had previously stated that "The most dangerous animal of all to capture is the gorilla", that was likely picked up by Merian C. Cooper because he was working on the movie "King Kong" at the same time he was involved in the making of "The Most Dangerous Game". "King Kong" was directed and produced by Merian C. Cooper.
Frederick "Fritz" Joubert Duquesne and Merian C. Cooper had both worked for RKO Pictures inside of one year from one another. The movie company behind both "The Most Dangerous Game" (1932) and "King Kong" (1933) was RKO Pictures.
It appears as though DNA and fingerprint analysis has failed to bridge the gap between Riverside and the Bay Area murders, as has analyzing the text of the Riverside communications to forge a conclusive link in language between southern and northern California. This left one final option: discovering a commonality in design between the lengthy Riverside Confession letter and the July 31st 1969 letters mailed to the San Francisco Chronicle, San Francisco Examiner and Vallejo Times-Herald. In other words, was there a recent trigger that caused the Confession letter author to delve into the library microfiche for suitable quotes from yesteryear? Long suspected to be based upon "The Most Dangerous Game" (1932), the 408 cipher author just happened to harvest the exact quote from its associate producer, spoken in 1932. What are the chances that the Confession letter author would find a equal length quote for his November 29th 1966 typed letter, harvested from the year of "Jack the Ripper" in 1888, after mimicking the wording from a recent newspaper article mentioning Cheri Jo Bates and "Jack the Ripper"? (see article clipping above).

After reading the newspaper article on November 24th 1966 quoting "Jack the Ripper", its easy to reconcile a Confession letter author typing "Ripper" like phrases such as "cut off her female parts and deposit them for the whole city to see", "finished the job out cutting her throat" and "I am stalking your girls now". Especially when the additional phrase of "it was about time for her to die", present in the Confession letter, could only be found in one newspaper article on December 11th 1888 (the year of "Jack the Ripper"), from newspaper archive searches spanning 1690 to 1966. December 11th 1888 being the same day it was reported that "Jack the Ripper" had possibly "cut the throat" of a woman on Bermondsey Street in London, causing great excitement in the neighborhood.

- Here is the newspaper article entitled "The Sturdy Beggar" featured in the Evening Bulletin newspaper from Providence, Rhode Island on December 11th 1888. The attacker in this instance motioned towards a possible knife in his pocket and threatened that "it was about time for her to die", just like the Confession letter author who typed "I said it was about time for her to die. I grabbed her around the neck with my hand over her mouth and my other hand with a small knife at her throat".
On July 31st 1969, we effectively have the Zodiac Killer using a quote from Merian C. Cooper, the associate producer of "The Most Dangerous Game" in 1932, only eleven days after the "Rampage" movie appeared on US television screens, that used a phrase based upon the Merian C. Cooper quote in its advertising. On November 29th 1966 we have an author commenting on the murder of Cheri Jo Bates, five days after a newspaper article featuring Cheri Jo Bates and "Jack the Ripper", using a quote from the "Jack the Ripper" era of 1888 in the form of "it was about time for her to die", and promising to "cut off her female parts and deposit them for the whole city to see". The Zodiac Killer and an unknown author using "man is the most dangerous animal of all" and "it was about time for her to die" from 1932 and 1888 respectively, less than two weeks after the "Rampage" (1963) movie and a "Jack the Ripper" quote in a newspaper article concerning Cheri Jo Bates. I find it difficult to believe in this many coincidences being accidental. This may be the product of one individual using the same technique in 1966 and 1969.

This individual parked the Chevrolet Impala in the Lake Herman Road turnout sometime prior to 9pm and 10pm on December 20th 1968 and wandered off into the night, before returning. Had this been the Zodiac Killer hunting for victims in the adjoining fields, the description of a pencil flashlight mounted on a gun now doesn't seem so fanciful. Apart from the eyewitnesses in the police report, only the Zodiac Killer would have known of this vacant Chevrolet Impala (had it been his). In other words, the Zodiac Killer may have brought up the notion of gun-mounted illumination, because he knew the hunt for victims initially extended beyond the turnout perimeter. An additional source of illumination that wouldn't have been required had the Zodiac Killer arrived at the turnout shortly after 11pm and remained within the confines of the turnout throughout. His murder of David Faraday and Betty Lou Jensen could easily have been achieved in a similar manner to that used at Blue Rock Springs, employing the headlights from his vehicle and/or a handheld flashlight to illuminate his victims from close range. The use of a pencil flashlight buys into the notion of a hunter stalking the surrounding fields of Lake Herman, along with his use of the phrase "man is the most dangerous animal of all" in the 408 cipher, plagiarized from the words of two big game hunters in Merian C. Cooper and Frederick "Fritz" Joubert Duquesne, who both worked for RKO Pictures in the 1930s.

This time he saw David Faraday and Betty Lou Jensen parked up in their Rambler, making any venture into the surrounding fields unnecessary. No wonder he wrote on August 4th 1969 "there was no need to use the gun sights. All I had to do was spray them as if it was a water hose". There was never any need to use gun sights in the turnout - but for a hunter stalking his prey in the fields of Lake Herman at distance, having left his vehicle for a protracted length of time - the marksmanship provided by gun sights would have come in much more useful. A Zodiac Killer driving a 1959/1960 white Chevrolet Impala, that he was only too glad to concede was brown in the very same letter.