Kim Jae-gyu was a South Korean politician, army lieutenant general and the director of the Korean Central Intelligence Agency. He assassinated South Korean President Park Chung Hee—who had been one of his closest friends—on October 26, 1979, and was subsequently executed by hanging on May 24, 1980.

Park Chung Hee, the third President of South Korea, was assassinated on October 26, 1979, during a dinner at the Korean Central Intelligence Agency (KCIA) safe house near the Blue House presidential compound in Jongno District, Seoul, South Korea. It was the first assassination of a head of state in Korea in 606 years, since the assassination of Gongmin of Goryeo. Kim Jae-gyu, the director of the KCIA and the president's security chief, was responsible for the assassination. Park was shot in the chest and the head, and died almost immediately. Four bodyguards and a presidential chauffeur were also killed. The incident is often referred to as "10.26" or the "10.26 incident" in South Korea.