Warning Shot is a 1967 film about a police sergeant who kills a man while on a stakeout, then must prove that it was self-defense. It is based on the novel 711 - Officer Needs Help by Whit Masterson. David Janssen stars as the accused officer, with supporting performances from Ed Begley, Keenan Wynn, Joan Collins, Stefanie Powers, Sam Wanamaker, George Grizzard, Carroll O'Connor, Steve Allen, Eleanor Parker, Walter Pidgeon, George Sanders and Lillian Gish.