Born in Buenos Aires, Maletti was ordained to the priesthood on 24 November 1973.

As a priest he served in various roles:[1][2] On 20 July 2001, Maletti was appointed bishop of San Carlos de Bariloche.

[1] He received his episcopal consecration on the following 18 September from Jorge Mario Bergoglio, archbishop of Buenos Aires and later Pope Francis, with bishop of Avellaneda-Lanús, Rubén Oscar Frassia [es], bishop of San Martín, Raúl Omar Rossi, auxiliary bishop of Buenos Aires, Horacio Ernesto Benites Astoul, and auxiliary bishop of Buenos Aires, Jorge Eduardo Lozano, serving as co-consecrators.

[3] As part of the Episcopal Conference of Argentina, Maletti served in different roles, including: Maletti died on 8 March 2022 in Buenos Aires, at the age of 72, from COVID-19, during the COVID-19 pandemic in Argentina.

[5][6][7] A funeral mass for Malettie was celebrated by the Archbishop of Buenos Aires and Cardinal Primate of Argentina, Mario Aurelio Poli, on 9 March at the Cathedral of Our Lady of the Rosary in Moreno.