For nearly 50 years, the Zodiac killer has remained a mystery.
It's a case that has captivated America because it has never been solved. Now, a Louisiana man claims in a new book that his biological father was the notorious Zodiac Killer of northern California, who is sought by authorities to this day.
In an interview with CNN's Erin Burnett, Gary Stewart says, "I believe for the first time in the history this case that I've presented more evidence that's ever been presented on any one suspect."
Stewart responds to critics who refuse to believe his claim on Erin Burnett OutFront.