https://www.amazon.com/Profiled-Zodiac-Examined-Serial-Killer/dp/1947521004/ref=sr_1_5?dchild=1&keywords=mark+hewitt+zodiac+killer&qid=1605109173&sr=8-5
Sure — it’s mentioned briefly in this book
https://www.amazon.com/Profiled-Zodiac-Examined-Serial-Killer/dp/1947521004