What period of time was the serial killer that inspired the film Dirty Harry active?
Dirty Harry:  The film drew upon the actual case of the Zodiac Killer as the Callahan character seeks out a similar vicious psychopath. Zodiac Killer:  The Zodiac murdered victims in Benicia, Vallejo, Lake Berryessa, and San Francisco between December 1968 and October 1969.
i don't know