They all died that day at 5:00 hours, on Avenida Quilín, the first two from multiple gunshot wounds and the third from a craniocerebral gunshot wound, as recorded in the respective Medical Death Certificates from the Legal Medical Institute.

According to the statements of their family members and an eyewitness, Mario Alvarado, Oscar Arellano, and Luis Soto were detained on September 17, around 16:00 hours, in the area of Arturo Prat and Franklin streets, by Carabineros officers belonging to the Fourth Precinct.

Their bodies were all found two days later at the Legal Medical Institute.

Considering the evidence gathered and the investigation carried out by this Corporation, with their detentions having been verified, and considering the causes of death as well as the time and place in which they occurred, the Superior Council reached the conviction that Mario Orlando Alvarado Ortiz, Oscar Leonardo Arellano Ochoa, and Luis Alberto Soto were victims of political execution by State agents while in detention, outside of any legal process, which constitutes a violation of human rights.