Elsehere, in the Kathleen Johns sub-forum, attacks in Watsonville, CA have been discussed: viewtopic.php?f=34&t=86 .
Also, the murder of Santa Barbara hitchhiker Karen Ann Signore has been suggested as a possible Zodiac crime: viewtopic.php?f=37&t=707 .

Along similar lines, Rosa Linda Zuniga of Watsonville, CA, was found bound and stabbed to death on July 27, 1971 (a few months after Signore and some of the Watsonville shootings). I don’t find any indication that she was raped in the following three articles, from the Star News and the Press Telegram: