Since arriving in the country, Giraldo offered sexual services to gay men in
Parque El Ejido, where he agreed to have sex under the sole condition that he was the "man" in the relationship. On April 6, he was hired by a local bank manager, Fidel Assad Buenaño Carriel, and brought to the latter's apartment. There, Buenaño wanted to engage in intercourse with Giraldo, but insisted that he take on the role of the "woman", to which Giraldo vehemently refused. After Buenaño insisted, Giraldo, blinded by sudden rage, proceeded to strangle his client. After realizing that he was dead, Giraldo took all the valuables from his apartment and fled, but soon after, went back to Parque El Ejido. On April 12, Giraldo was hired by Carlos Abel Ponce Ponce, a
Mexican agricultural scientist who was working in Quito. He was taken to his apartment, where, presumably under the same circumstances, he proceeded to strangle Ponce to death. A day later, the same pattern emerged in the killing of Pablo Alejandro Garcés Calero, a well-respected
chaplain for the Santa Rita neighborhood. In an effort to forget the murders, Giraldo and Guanga left for Colombia, where they resided for a few months, but returned to Ecuador in September of that year. By that time, alarms were raised in Quito's gay community about recent killings of homosexual men, which began in January with the death of an older man who was strangled to death in his apartment, naked, with his feet tied to the chair. While there were claims in online forums that some had seen the killer and even knew his identity, nobody contacted the police, fearing it would damage the community's reputation. The killings resumed on September 20, when 26-year-old Carlos
Jorge Zavala Barona, a shareholder in an insurance company, was found strangled in his apartment, which had also been robbed. ==Arrest, trial and imprisonment==