Carlos Segundo Alvarado Neira died that day at 13:20 hours, in the San Carlos canal (Tobalaba and Lo Hermida sector), due to gunshot wounds with thoracic-cervical and thoracic-abdominal exit trajectories, as certified by the Medical Death Certificate from the Legal Medical Institute.

According to witness statements, his body was found on the bank of the San Carlos canal.

It should be noted that between October 8 and October 30, 1973, 16 people appeared dead in similar conditions in that same location. Of this group, the National Commission for Truth and Reconciliation was only able to identify Jaime Antonio Rivera Aguilar and Eduardo Santos Quinteros Miranda, whom it declared victims of human rights violations. The other 14 people were not identified.

Despite not having determined the exact circumstances of his death, the Superior Council, considering the era, the cause of death, and the location where the body was found, reached the conviction that Carlos Segundo Alvarado Neira was executed outside of any legal process by State agents. For this reason, it declared him a victim of human rights violations.