el subjefe, la subjefa - the person who is second in commandSpanish example: Un grupo de hombres armados asesinó el lunes al subjefe de la policía.
English example: A group of armed men on Monday murdered the deputy police chief.
Source: el subjefe, la subjefa - the person who is second in command (https://www.123teachme.com/spanish_feeds/word_of_the_day/2021/5/29)