Alfredo Astiz was sentenced along with 11 other death squad members who stood trial over crimes committed against dissidents during the so-called 'Dirty War'.
Marking the end of a 22-month trial in which 79 survivors gave evidence, 12 defendants were sentenced to life while four others were given between 18 and 25 years in jail.
Astiz, nicknamed for his cherubic looks, infiltrated human rights groups whose members were later kidnapped and was convicted in absentia in Europe of killing two French nuns held at the ESMA Naval Mechanics School where thousands of dissidents were held and killed.