Rick Marshall was born in Texas (1928 - 2008), which makes him the correct age range as testified to by surviving eyewitnesses of between 35-45 years, during the confirmed four attacks and five zodiac murders.
He lived in the key areas during the majority of the attacks, residing in Riverside, nearby the murder scene of Cheri Jo Bates in 1966 and in a basement residence in Scott Street,San Francisco, just a few miles from Washington and Cherry Street where taxi driver Paul Stine was killed with a single shot to the head.
The killer requisitioned the cab at the corner of Mason and Geary Street, also in close proximity to the Scott Street residence. See distance on Google maps.
Rick Marshall lived in San Francisco for 20 years, between 1969 and 1989.
Rick Marshall worked for KTIM, a Bay Area radio station and as a projectionist in the Avenue Movie Theatre, which specialized in silent movies and one of his favourite films was the 'Red Phantom' .
View movie poster handwritten by Rick Marshall for two upcoming Charlie Chaplin shows at the Avenue Theatre, Caught in a Cabaret (1914) and The Property Man (1914).
He was also allegedly in possession of a Royal Typewriter, which is another link to Zodiac case in respect to the typed 'Confession Letter', sent to the Riverside Police and Riverside Enterprise on November 29th 1966, graphically describing the repeated stabbing and murder of Cheri Jo Bates on October 30th 1966 outside the Riverside City College Library.
The Exorcist Letter , widely believed to be the final letter of the Zodiac sent on January 29th 1974, after a three year drought of correspondence by the killer, included strange symbols said to marry up closely with ones used on KTIM call letters.
Robert Graysmith, who spent ten years researching for his book Zodiac, has ultimately confirmed he visited the home of a man who knew Rick Marshall, ending up in the homeowners basement, where he described hearing footsteps in the above room which unsettled him, as the owner had reassured him they were alone. This man was Bob Vaughn, a professional organist, who played in silent movie theaters, including the Port Theater, in which Rick Marshall worked in 1974, as well as the Roxie Theater in San Francisco and was depicted in the 2007 David Fincher Zodiac film, to be the person responsible for the handwriting on the movie theater posters (view clip). However, he would have been too old to be the Zodiac Killer based on eyewitness testimony and was never regarded as a suspect by law enforcement.
Speculation circulated in certain quarters that Rick Marshall may have had an accomplice in the Zodiac crimes, which included Richard Gaikowski because of his love of classic films also, and his running of the Roxie Theatre in the Bay area.
Rick Marshall was interviewed for a television documentary in which he said "I must have a double floating around, I hope the poor guy doesn't look like me, but the fact is, the characteristics you just mentioned fit me almost to a tee, I really am startled at the mass and accuracy of the detail, and obviously if they had been that forthcoming about that at the time I would have understood why they were investigating me, my innocence not withstanding, the details do fit".
Below is the Crimes of the Century video showing the Richard Marshall interview. It begins 1 minute 14 seconds into play. SEE BELOW. See also the Rick Marshall extracts from the film Zodiac here.
Rick Marshall was investigated by the Napa County Police Department, but nothing tangible emerged and Marshall was in later years cleared from ongoing investigations, shortly before his death in 2008.
1963 June 4th-The Domingos/Edwards Murders
1966 October 30th-The Cheri Jo Bates Murder
1966 November 29th -The Confession letter
1966 December- The Riverside Desktop Poem
1967 April 30th- Bates had to die letter
1968 December 20th-The Lake Herman murders
1969 July 4th-The Blue Rock Springs Attack
1969 July 31st- Vallejo Times Herald letter and
408 Cipher Page1 (solved)
1969 July 31st - Chronicle letter and
408 Cipher Page 2 (solved)
1969 July 31st- Examiner letter and
408 Cipher Page 3 (solved)
1969 July 31st-The Complete 408 Cipher
1969 August 4th- Debut of Zodiac letter
1969 September 27th- The Lake Berryessa attack
1969 October 11th-The Presidio Heights murder
1969 October 13th-The Paul Stine letters
1969 October 20th-Call to chat show
1969 November 8th-The Dripping Pen Card and
340 Cipher (unsolved)
1969 November 9th-The Bus Bomb letter
1969 November 28th-The Betsy Aardsma Murder
1969 December 16th-The Fairfield Letter
1969 December 20th-The Belli letter
1970 Feb 21st- The Hood and Garcia Murders
1970 March 22nd-The Modesto attack
1970 April 20th-"My Name is" Letter,
Cipher 3 (unsolved) and Bus Bomb diagram
1970 April 28th-The Dragon Card
1970 June 26th-The Button letter,
Cipher 4 (unsolved) and map
1970 July 5th-The Sleeping Bag Murders
1970 July 24th-The Kathleen Johns Letter
1970 July 26th-The Little List Letter
1970 Sept 6th-The Donna Lass Disappearance
1970 October 5th-13 Hole Postcard
1970 October 27th-The Halloween Card
1971 March 13th-The Los Angeles Letter
1971 March 22nd-The Pines Card
1972 November 13th-The Santa Barbara Attack
1974 January 29th-The Exorcist Letter
1974 February 14th-The SLA Letter
1974 May 8th-The Citizen Card
1974 July 8th-The Red Phantom Letter
1978 April 24th-The 1978 Letter
1990 December-American Greetings Card
THE HALLOWEEN CARD TETRACTYS
A thorough examination of the four dots the Zodiac Killer placed on the Halloween Card envelope and at the foot of the card, along with the rest of the symbol.
Also the possible reasoning behind 'peek a boo you are doomed' written around the knothole of the tree, the incorrect spelling of Paul Avery and the underlined section LAV, along with a plausible connection to the SLA Letter mailed just over three years later.