Oscar Santiago Valenzuela Mella died that day at 1:10 a.m., at the intersection of Mac Iver and Avenida Libertador Bernardo O’Higgins, due to thoracic trauma caused by a bullet, as stated in his Death Certificate.

According to evidence contained in the judicial proceedings, on the night of his death, Oscar Valenzuela was walking with a friend in front of the National Library. At that location, they encountered a group of people, and an argument ensued between them.

One of the members of the aforementioned group fired at Valenzuela Mella and subsequently fled the scene. As a result of the wound, he died immediately.

Prior to the incident, the perpetrator—who had been a member of the Ejército and an official of the Dirección de Inteligencia Nacional (DINA)—had been drinking at a restaurant along with other individuals, among whom were members of the Ejército and security agents.

The weapon used was state property, assigned to an active-duty officer who was present that night and who provided it to the perpetrator upon leaving the establishment.

The perpetrator of the crime was sentenced to a custodial sentence by the Court of Appeals. However, he was never located to be notified of the ruling.

Considering the evidence gathered, the Superior Council concluded that the death of Oscar Santiago Valenzuela Mella was due to an abuse of power committed by an individual linked to security agencies, who was shielded with impunity by State agents. For this reason, it declared him a victim of human rights violations.