North Korea reportedly executed its defense chief, Hyon Yong Chol, under the order of dictator Kim Jong Un, after the official fell asleep during a meeting. South Korea’s spy agency briefed its lawmakers that hundreds watched as the defense chief was executed by firing squad armed with anti-aircraft guns. National Public Radio reports that this follows a string of other executions in an ongoing purge in North Korea, with South Korean intelligence saying that 15 other officials were executed last month.