The following year, both of his parents were murdered in an attack perpetrated by an Aprista Party leader, so the general direction of the newspaper passed to his uncle Aurelio Miró Quesada, while the sub-directorship went to him.

In 1949, he entered the diplomatic service and the military government of Manuel A. Odría appointed him ambassador to Chile, a position in which he remained until 1952, when he was transferred to the Peruvian embassy in Mexico.

[1] Upon his return to Lima, he joined the conspiracy to place General Zenón Noriega Agüero in the government, but when the plot was discovered, he took refuge in the Brazilian embassy and then went into exile to Chile.

From 1963 to 1966, he was Peru's ambassador to Belgium and then to Italy until 1968 when he resigned due to the government's decision to apologise to Armando Villanueva, president of the Chamber of Deputies whom he had refused to receive in Rome.

[1] In 2016, his grandson José Carlos Yrigoyen published his biography titled Orgullosamente solos (Proudly alone), in which he details his relationships with fascism, as well as his post-war political career.