Dirty Harry is a 1971 American action crime thriller film produced and directed by Don Siegel, the first in the Dirty Harry series. Clint Eastwood plays the title role, in his first outing as San Francisco Police Department (SFPD) Inspector “Dirty” Harry Callahan. The film drew upon the actual case of the Zodiac Killer as the Callahan character seeks out a similar vicious psychopath.A killer (Andrew Robinson) shoots a girl in a hotel rooftop swimming pool. Police arrive at the crime scene, where SFPD Inspector Harry Callahan (Clint Eastwood) finds a blackmail note signed “Scorpio” ordering the city to pay $100,000 or he will continue to kill. The mayor (John Vernon) asks police officers what is being done to track the killer.