Welsh Chappie takes us back to the Lake Herman Road Murders: 
'Just thinking about the who LHR incident again. I have mentioned the idea that Zodiac may have been there on foot and listed several reasons why this theory is plausable. But today I have been looking over the scene and reports and noticed something that seems to suggest that if Zodiac was in a vehicle at LHR, it's unlikely that he parked his vehicle where the one witness said he saw a second vehicle parked. What we know for sure is this'.
Another thorough examination of the crime scene at Lake Herman Road follows this premise. Visit the forum thread here.

Quicktrader questions the crime scene at Lake Herman Road and the sequence of events on that fateful cold night back on December 20th 1968. This crime had no direct surviving witnesses to the crucial time period after James Owen passed the Lake Herman Road turnout, and before Stella Medeiros arrived and discovered the bodies of David Faraday and Betty Lou Jensen.

The only answers to the crime lay in the Rambler, the position of the two victims and the numerous bullets littering the gravel turnout. The killer had unfortunately disappeared into the night. Many theories are discussed in this lively forum thread, that may provide some of the answers that have constantly centered around the initial murders and birth of the Zodiac Killer. To view the thread visit here.

Humble Oil Connection to Zodiac?
In this thread from March 30th 2013 Morf13 examines if any connection exists between the Zodiac Killer, Humble Oil in Benicia and the oil refinery in Santa Barbara County. 
This area generated interest in the Zodiac community, regarding the Robert Domingos and Linda Edwards murders, on an isolated beach in early June of 1963 and seven years later, the double murder of John Franklin Hood and Sandra Garcia on February 21st 1970, within a few miles of the earlier slayings.
Morf13 considers the possible link, particularly in view of the Humble Oil connection with the first crime. See here.The forum thread opens with a question 'In the Zodiac case, there was a Humbe Oil located in Benicia not far fom Lake Herman Road where the Z crimes officially started. But interestingly, there was an oil refinery very close to the Domingos/Edwards crime scene. Could Z(if he was the killer of Domnigos/Edwards)have transferred up to the Benicia refinery? '. Visit the thread to decide.

ZKS  Hanging round the crime scene....
The Zodiac Killer has been inextricably linked to five murders and the four locations of Lake Herman Road, Blue Rock Springs Park, Lake Berryessa and Presidio Heights 
This forum thread by jamesmsv on October 26th 2013 considers the possibility that the Zodiac Killer may have remained behind after his crimes, observing from a safe distance.
It is not unheard of for criminals to hang around a crime scene and become the hidden face in the crowd.
jamesmsv states  'I was thinking about Z's descriptions of the Presidio Heights police activities and it got me thinking - what was the crowd situation there'.
To view the entire thread visit here.

ZKS  Interview with Lake Herman Road Witness James Owen
Posted on March 30th 2013, Morf13 initiated a forum thread based on a surviving witness to the Lake Herman Road crime scene. On December 20th 1968 the Zodiac Killer began his murderous campaign that claimed the lives of David Faraday and Betty Lou Jensen. Seven months later he sent three coded messages to three Bay Area newspapers to leave the authorities in no doubt they had a new breed of killer on their hands.
One witness that night was James Owen, who drove past the isolated Lake Herman Road turnout, during the relevant time frame.
Morf13 recently contacted James Owen by phone, to pick his brains and draw his recollections of the Zodiac case. The full transcript of that phone call and subsequent discussion can be found at ZodiacKillerNet.