The Day of the Dolphin originally going to be directed by Roman Polanski for United Artists in 1969, with Polanski writing the script. However, while Polanski was in London, England, looking for filming locations in August 1969, his pregnant wife, the actress Sharon Tate, was murdered in their Beverly Hills home by disciples of Charles Manson. Polanski returned to the United States and abandoned the project. The following year it was announced Franklin Schaffner would make the movie for the Mirisch Corporation. These plans were frustrated and Joseph Levine ended up buying the project from United Artists for Mike Nichols. The film was mostly shot
Charles Manson a popular urban legend, Manson auditioned unsuccessfully for the Monkees in late 1965; this is refuted by the fact that Manson was still incarcerated at McNeil Island at that time. In June 1966, Manson was sent for the second time to Terminal Island in preparation for early release. By the time of his release day on March 21, 1967, he had spent more than half of his 32 years in prisons and other institutions. This was mainly because he had broken federal laws. Federal sentences were, and remain, much more severe than state sentences for many of the same offenses.