Guarda su CINEBLOG01. On March 4, 1970, UPR-Río Piedras student Antonia Martínez Lagares was assassinated by a policeman while she was standing at a balcony of the Ponce de León Avenue. This documentary shows who Antonia was and recounts the incident with testimonies of witnesses, including that of director José Artemio Torres, who was also at the balcony.