Carlos Omar Bastidas Zegers died that day at 10:25 hours, on a public thoroughfare, due to gunshot wounds to the cranium, encephalon, thorax, and abdomen, as indicated by the Medical Death Certificate from the Legal Medical Institute.

José Antonio Del Pero Bustos died that day at 6:00 hours, on a public thoroughfare, due to multiple gunshot wounds, as indicated by the Medical Death Certificate from the Legal Medical Institute. The Autopsy Report notes that his body presented 37 bullet impacts and that he was admitted to that facility as a "John Doe" (NN), sent by the Carabineros station in Huechuraba.

Mario Antonio Gallardo Villagrán died the same day at 11:00 hours, on a public thoroughfare, due to multiple gunshot wounds, as indicated by the Medical Death Certificate from the Legal Medical Institute.

According to testimonies from family members, the three young men were detained in the days immediately following September 11, 1973, by military personnel and carabineros, at their respective homes in the Parque Santa Mónica neighborhood, in the commune of Conchalí, an area where various operations were carried out.

Their bodies were found by their families at the Legal Medical Institute alongside those of brothers Arturo and Francisco Deila Santos, who were detained in the same neighborhood around the same time; the cases of the latter were known to this Corporation and declared victims of human rights violations.

Considering the background information gathered and the investigation conducted by this Corporation, the Superior Council reached the conviction that Carlos Omar Bastidas Zegers, José Antonio Del Pero Bustos, and Mario Antonio Gallardo Villagrán were executed by State agents outside of any legal process, while they were being held deprived of their liberty.

For this reason, it declared them victims of human rights violations.