A coup d'état ousted President Isabel Perón in 1976, and started a military dictatorship, whose leaders styled it "National Reorganization Process".
Estévez Boero was chosen to represent Santa Fe in the national Chamber of Deputies in 1987, thus becoming the first Socialist legislator since the death of Alfredo Palacios in 1965.
His funeral was conducted at the National Congress and attended by leaders of the whole political spectrum, including President Fernando de la Rúa.
Vice-president Carlos Álvarez said in his speech: "One of our best men is gone from us, just at a time when we needed him most to revert the loss of prestige that afflicts the political class.
Estévez Boero embraced politics with a passion, not to fulfill personal ambitions or to augment his wealth, but to realize the ideal he had assumed since he was very young: making a great country, which may provide opportunities to live with dignity."
The remains were then sent by airplane to Rosario, where his wife and sons, along with other political leaders and surrounded by a crowd, had him buried in the family's mausoleum at the Saviour's Cemetery.