There is an interesting book about the Colonial Parkway murders.
A Special Kind Of Evil: The Colonial Parkway Serial Killings https://www.amazon.com/dp/1947290045/ref=cm_sw_r_cp_apa_i_48chCb49TV3D4
It was creepy reading about Ragged Island, I had inadvertently been where the truck and bodies were found before knowing anything about the killings.
As the brother of Cathy Thomas, who together with her girlfriend Rebecca Dowski were the first two victims in the Colonial Parkway Murders, I have always thought that the idea that the Colonial Parkway Murders were related to the Zodiac was a long shot at best. As JackieBlue1970 points out, we aren't even sure that the Colonial Parkway Murders are all related, never mind tying them into Zodiac. Theorize away, but proceed with caution.
If you want to learn a bit more about the Colonial Parkway Murders, here are some links to help you come up to speed.
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Thanks.
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Bill Thomas, Brother of Cathy Thomas, Colonial Parkway Murders
We try to keep up to date and accurate— unfortunately, Wikipedia recently deleted dozens of our links to media coverage, podcasts and interviews, so their list of links is much shorter than it should be.
https://en.wikipedia.org/wiki/Colonial\_Parkway\_Murders
https://pilotonline.com/image_14f03a99-cf6e-5f22-8c87-b6ba935bf5de.html
Eight part in-depth newspaper series with hundreds of photographs, video interviews and some of the best writing ever on the Colonial Parkway Murders. It is a little hard to navigate, but well worth the time.
http://crimefeed.com/2017/09/colonial-parkway-murders/
April 9, 2018 30 Years Later: The Colonial Parkway Murders Part One WAVY-TV, Norfolk, VA
April 10, 2018 30 Years Later: The Colonial Parkway Murders Part Two WAVY-TV, Norfolk, VA
https://www.pilotonline.com/news/crime/article_3c3d2efa-6a64-506c-84ec-efc50916159d.html
https://www.pilotonline.com/news/crime/article_e5f643ce-a437-5bdb-b2e2-3559501351e2.html
https://www.pilotonline.com/news/crime/article_dd5c74dd-c581-5730-afd6-4d1a2da04e84.html
https://shows.pippa.io/the-murder-in-my-family/cathy-thomas/
Administered by Bill Thomas and Kristin Dilley
https://www.facebook.com/ColonialParkwayCase/
Administered by Joyce Call Canada and Jennifer Phelps
https://www.facebook.com/What-happened-to-Richard-Keith-Call-Cassandra-Hailey-48312425938/
https://www.facebook.com/Colonial-Parkway-Victims-Gone-But-Not-Forgotten-152566591439809/
https://www.youtube.com/watch?v=9nTK0XeyFgo
The book covers a lot of the basics of the case and is worth a read. Available in e-book and trade paperback editions.
We have also done scores of additional interviews, including television, radio, print, and true crime podcasts, and are currently shooting a limited television series for the Oxygen Network via Texas Crew Productions/XG Productions. It will likely air in May/June 2020.
Thanks for your interest and support from the Call, Dowski, Edwards, Hailey, Knobling, Lauer, Phelps and Thomas families.