Cho Nam-chul
Cho Namchul (November 30, 1923 - July 2, 2006, alternately Cho Namcheol) was a professional Go player (Baduk in Korean). He died of natural causes in Seoul at the age of 83.
Choe Chang-ik
Choe was murdered by the secret state police in 1960 at the age of 63 or 64, while imprisoned in Pyongyang.