Mișcarea Legionară
Duca was assassinated by three Iron Guard members, that formed the Nicadori Iron Guard death squad, comprising Nicolae Constantinescu, Ion Caranica, and Doru Belimace. All three were arrested straight away and sentenced to hard labour for life. They were all killed, as were many other Iron Guard leaders, on 30 November 1938 while being transported to Jilava prison.