A report in New York Magazine says a new book, The Most Dangerous Animal Of All, will reveal the identity of the killer.
The Zodiac killer terrorised northern California for many years.
The Zodiac murdered victims in Benicia, Vallejo, Lake Berryessa, and San Francisco between December 1968 and October 1969. Four men and three women between the ages of 16 and 29 were targeted.
The killer gave the name "Zodiac" in a series of letters sent to the local press, which contained cyphers.
It's not the first time someone has claimed to have revealed the killer's identity.
This post has been corrected to reflect the fact that some of the information came from Wikipedia.