Carlos Eduardo Robledo Puch was born on January 19, 1952, in Buenos Aires, Argentina. He was the son of Víctor Robledo Puch and Josefa Aída Habendak. His father worked as a technician for General Motors, while his mother was a housewife who had emigrated from Germany after World War II. Carlos had a notable family background with connections to historical figures in Argentina, including Dionisio Puch, who was a governor of Salta Province, and Martín Miguel de Güemes, a military leader during the War of Independence.

In 1956, when Carlos was four years old, his family moved to Borges Street in Olivos, a suburb of Buenos Aires. They rented an apartment above a hardware store. Growing up in a middle-class family, Carlos was known for being shy and quiet, similar to his mother. He showed an interest in football, supporting the River Plate team. During his childhood, he studied piano and learned German.

Carlos had a difficult time in school. He often stole items from his classmates and faced bullying. In 1967, he was caught stealing money from the secretary’s office, which led to his expulsion from school. His relationship with his father was also troubled. After his arrest years later, significant tragedies struck his family. His grandmother passed away, and his mother attempted suicide. His father reportedly blamed Carlos for these events.

In December 1968, Carlos had his first legal trouble when he stole a motorcycle from a bicycle workshop. He confessed to over 14 thefts during his arrest and was sent to a reformatory for twenty days. Towards the end of 1969 or the beginning of 1970, he met Jorge Antonio Ibáñez, who would become his accomplice in future crimes.

In early 1971, Carlos and Jorge participated in several robberies, stealing large sums of money and purchasing luxury items. They were arrested in January 1971 for one of their crimes but were soon released on bail. After their release, they escaped to Mar del Plata. 

Carlos Eduardo Robledo Puch began his series of murders on May 3, 1971. He and his accomplice Jorge Antonio Ibáñez entered an auto repair shop in Vicente López. Puch shot and killed the owner of the shop. He also injured and sexually assaulted the owner's wife, who survived the attack with her 10-month-old baby. Puch shot toward the baby's cradle but missed.

Days later, on May 14, Puch and Ibáñez broke into a nightclub in Olivos. After stealing more than two million pesos from the storage room, Puch found two sleeping watchmen in a small room. He shot and killed both of them before they escaped.

On May 24, 1971, Puch and Ibáñez entered a supermarket in Vicente López. Puch shot and killed a 61-year-old watchman and stole over five million pesos. They drank whiskey at the crime scene to celebrate.

On June 13, 1971, they kidnapped a 16-year-old girl from a highway in Buenos Aires. After driving her to a secluded area, Ibáñez assaulted her. Puch told her to walk away without looking back before shooting her five times, killing her.

Eleven days later, on June 24, Puch and Ibáñez kidnapped a 22-year-old woman. They drove her to a different area, where Puch shot her multiple times in the back after Ibáñez attempted to assault her.

On August 5, 1971, Ibáñez died in a car accident while Puch was driving. Some rumors suggested that Puch might have killed Ibáñez. Following this, Puch partnered with Héctor Somoza.

Their first crime as partners occurred on November 15, 1971, when they entered a supermarket. Puch killed the 50-year-old watchman, who had surprised them. Two days later, they stole 90,000 pesos from an auto agency, killing the watchman there as well.

On November 25, Puch and Somoza broke into a Dodge agency, stole 1.5 million pesos, and shot the watchman three times, killing him before escaping.

Puch's final murder took place on February 3, 1972, in a hardware store in Tigre. He killed the watchman after locking him in a small room. In a confusing incident, Puch shot Somoza, fearing for his life, and attempted to cover up the murder. On February 4, 1972, police arrested Puch when they discovered his identification card in Somoza's pocket.