Mor Roig was born in Lleida, Spain, but immigrated to Argentina with his parents and settled in San Pedro.

[1] In 1971, Mor Roig was appointed Minister of the Interior under the de facto presidency of Alejandro Agustín Lanusse.

His appointment caused controversy within the Radical Civic Union, as large factions of the party were opposed to the military regime in power at the time.

[2] On 15 July 1974, Mor Roig was assassinated by a commando of the Montoneros while dining at a restaurant in San Justo.

[3] His killing, which came two weeks after the government of Isabel Perón took office, has been interpreted as a way to intimidate the new government and to make sure the Montoneros would not be left aside in future political negotiations;[4] however, it has also been explained as an act of revenge for the 1972 Trelew massacre of 16 political prisoners, committed during Mor Roig's tenure as Minister of the Interior.