The suspect was dubbed the Zodiac Killer because some of the cryptograms included astrological symbols and references. Poyser said recent advances in DNA testing prompted investigators to seek a match on two of the killer's letters. "It was coincidental," Sampayan said of the new DNA test occurring at the same time as the breakthrough in the Golden State Killer case. One of those amateur sleuths, Tom Voigt, said the key to solving the Zodiac killings is mimicking the Golden State Killer investigation, which included forming a full-time task force dedicated to the case and exploiting publicly accessible DNA databases. "And it's to simply copy what happened to the Golden State Killer."

Source: ABC News May 03, 2018 17:03 UTC