Will DNA Solve 1969 Zodiac Murders?

Figure No. 3: The Father

William Collins, a journalism graduate student in New York, has a theory about someone ke knew well. "My father, Charles Clifton Collins, may be the Zodiac Killer," he told Primetime. Collins made the connection when he saw the Zodiac's handwriting in a book a few years ago. "I thought, 'Oh my God, that's my dad's handwriting,'" he says.

As he read the book, he found more coincidences:

His father, who died in 1993, looked like the composite sketch. The father wore military-style shoes, size 10 ½. He lived in San Francisco only during the time of the killings. His initials, CCC, appeared on a card sent by the Zodiac to rile police.

Collins gave Primetime an envelope sealed — and licked — by his father a decade ago, as well as a sample of his own DNA for verification.

"I need to know if Charles Clifton Collins, my father, the guy who held me when I was a baby … was a serial killer," he said. "I have to know. I have to know."