what do we know? >> it is one of the most haunting unsolved cold cases. infamous zodiac killer. responsible for at least seven murders between 1968 and 69. zodiac claimed 37 killings. zodiac taunted authorities for years by sending letters with the zodiac symbol. a dozen possible suspect. the nonprofit group case breakers.org said it was a man named gary pran sis post from northern california. he died in 2018 at 80 years old. case breakers said he is confident they have nailed the zodiac. >> my f.b.i. guys say it is match. we have six people he has confessed to that he was the zodiac. three of them on our court