Answer:
Betty Lou Jensen and David Faraday were shot to death on Lake Herman Road near Gate #10 of the Benicia Water Pumping Station on December 20, 1968.
Darlene Ferrin and Mike Mageau were shot in the parking lot of the Blue Rock Springs Golf Course in Vallejo on July 4-5, 1969. Darlene died but Mike recovered.
Cecelia Shepard and Bryan Hartnell were stabbed repeatedly at what is now known as Zodiac Island at Lake Berryessa on September 27, 1969 in Zodiac's only known attack during daylight hours. He wore an executioner-like costume to conceal his identity. Cecelia died but Bryan survived.
San Francisco Yellow Cab driver Paul Stine was shot in the head at point blank range in his cab in the Presidio Heights area of San Francisco on October 11, 1969.