Dirty Harry local and federal police committing offences and overstepping their authority by entrapment and obstruction of justice. Author McGilligan, argued that America needed a hero, a winner at a time when the authorities were losing the battle against crime. The box-office success of "Dirty Harry" led to the production of four sequels. In the 2007 film "Zodiac", also set in San Francisco and inspired by the Zodiac Killer, cartoonist Robert Graysmith approaches police detective Dave Toschi at the cinema, where he is watching "Dirty Harry" with his wife. When Graysmith tells Toschi he is going to catch the Zodiac killer, Toschi
William M. Callaghan the Maritime Transportation Research Board under the National Academy of Sciences. He would later have a transport ship named after him: the . Late in life, Callaghan resided in Chevy Chase, Maryland. Following a stroke, he died on July 8, 1991, at Bethesda Naval Hospital. His first wife, Helen Brunett Callaghan (1896–1970), and second wife, Martha Rawlins Callaghan (1905–1973), predeceased him. He was survived by his third wife, Sarah Duerson Callaghan (1914–2011), and two children, William M. Callaghan Jr. (a retired US Navy rear admiral) and Jane Callaghan Gude (c. 1925–2008), as well as eight grandchildren. Callaghan's grandchildren include William