Juan Guillermo Romero Véliz died that day at 6:55 hours, at the Institute of Neurosurgery, due to cranial and facial trauma, as certified by the Medical Death Certificate from the Legal Medical Institute.

Juan Romero's family members stated that he was assaulted near midnight on September 27, 1984, at the intersection of Avenida Santa Rosa and Avenida Américo Vespucio, while returning home after finishing his work. A national day of protest was taking place that day, and traffic toward his home was interrupted, which is why he had to stop in the aforementioned area.

Three days later, his spouse found his body at the Legal Medical Institute and learned that he had died at the Institute of Neurosurgery, where he had been sent from the Hospital Sótero del Río. He had been admitted to that medical center in the early hours of September 28 in very poor physical condition, as a result of the blows he had received.

Eyewitnesses asserted that, that night, Carabineros officers beat a group of people they had detained at that location.

For its part, Carabineros informed the public that officers from their institution did not act at the scene, asserting that those responsible for the beating that caused the death of Juan Romero and the injuries of another person were six unknown civilians, according to the version received from this other person who also arrived at the hospital severely wounded.

However, this person turned out to be mentally disabled, and in the police report sent to the Criminal Court, they were identified as the aggressor of Juan Romero in a street brawl.

The judicial investigation into the events was temporarily dismissed, as the identity of those responsible could not be established.

Although the investigation carried out by this Corporation could not establish that those responsible for the injuries that caused the death of Juan Guillermo Romero Véliz were State agents, the Superior Council, bearing in mind the circumstances in which it occurred, reached the conviction that it was due to the political context of that time.

For this reason, it declared him a victim of political violence.