Classification: Documented

Pedro Alonso López: the Monster of the Andes and the numbers the files cannot settle

Arrested in Ecuador in 1980, Pedro Alonso López claimed hundreds of killings of children across three countries. That number became a headline, yet a study of prison records identifies four convictions for named victims, combined into a 16-year sentence. This dossier follows the victims, records and gaps obscured by the criminal’s notoriety.

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The child who raised the alarm

In March 1980, in Ambato, Ecuador, a 12-year-old girl alerted her mother after an attempt to take her away. According to Martha Alexandra Vargas Aguirre’s reconstruction using records of the former García Moreno prison, Pedro Alonso López’s detention opened with four pending cases; he entered the city’s detention centre on 20 March. Accounts of that period also connect the investigation with bodies exposed after flooding. The precise sequence deserves caution: the dissertation reconstructs events decades later, and the episode cannot stand in for the court record of each death.

The nickname “Monster of the Andes” travelled easily across borders. The girls’ names rarely did. This account begins with the child who managed to call for help and follows four victims named in an analysis of the judgments. The violence is real and serious without inflating its totals.

Three counts that answer different questions

Reports about López contain at least three different sets of numbers. The first concerns confessions attributed to him. The Ecuadorian study gives one version of 101 alleged killings in Ecuador and roughly 200 more in Peru and Colombia; elsewhere, 110 or “over 300” appears. A confession is not proof, and the shifting figures cannot be treated as a verified roster of victims.

The second set concerns remains and disappearances associated with the investigation in press accounts. Counts such as 53 or 57 remains circulate. Without a complete public record of examinations, identifications and case-by-case forensic links, those numbers cannot automatically become a total of murders judicially attributed to López. Finding a body, identifying it and securing a conviction answer separate questions.

The third set concerns prosecutions and judgments. Vargas Aguirre says she examined the archives of the former García Moreno prison and found 16 proceedings in Ecuadorian provinces; some expired. Her reading identifies four distinct 16-year sentences, later consolidated into one term. She explicitly says López was not found guilty of all 53 killings attributed to him by the press of the time. The gap between 16 proceedings, four convictions and hundreds of claimed deaths is this dossier’s documentary core.

Four names in the archive

The legal study links the four sentences to the deaths of Amparo León Gómez in Imbabura; Rosario Morocho Masabamda and Vilma Margoth Punina Chicaiza in Tungurahua; and Aidé Chinga Moreira in Manabí. For Amparo, the author also describes a conviction for sexual violence. The first judgment she identifies is dated 31 August 1981. She cites a Tungurahua decision of 30 August 1982 while discussing the court’s assessment of criminal responsibility.

These names are neither a complete list of missing girls nor grounds for dismissing every other allegation. They are the victims of the four convictions the study identifies in the archive it examined. The dissertation is an academic interpretation of court records; this investigation did not independently inspect every original case file. It also conflicts with a 1 September 1994 El Tiempo report that describes a conviction involving 16 minors. Readers should see that disagreement, not a falsely certain resolution.

How four sentences became one prison term

Under the Ecuadorian Penal Code then in force, the category of imprisonment involved had a 16-year ceiling, according to the legal analysis. Rules on concurrent offences and consolidation of judgments led a court in Imbabura to impose a single 16-year term instead of simply adding the four judgments. That did not erase the convictions identified by the author; it determined the time to be served under that law. She also reports a reduction of 382 days for prison conduct.

A contemporary El Tiempo report of 5 September 1994 says López left Ecuadorian prison on 29 August, after roughly 14 years and five months, and was deported to Colombia. Together, those sources explain the release without claiming that he “served 14 years for 300 murders”. The 300 figure came from accounts and confessions; the term arose from the cases addressed in Ecuador.

A Colombian case file destroyed by fire

The matter did not end at the border. El Tiempo reported an arrest warrant issued in 1984 by a Colombian criminal investigation court. López passed through Ipiales and Pasto before being taken to El Espinal, Tolima, to face local allegations.

An article published on 6 September 1994 describes a less familiar loss: the file used to investigate children’s deaths in El Espinal had been destroyed in a fire around 1991 at the building housing the Fifth Criminal Investigation Court. A prosecutor was trying to reconstruct evidence under a short deadline. The article speaks of eleven children, but describes allegations and investigative steps, not eleven further convictions. Lost records help explain why public suspicion could be vast while judicial proof remained fragile. The account includes boys among the cases, another reason the stock phrase “300 girls” oversimplifies even the allegations.

On 14 September the newspaper reported López’s transfer to the psychiatric annex of Bogotá’s Cárcel Modelo while prosecutors considered his legal status. Later accounts place his release in Colombia in 1998. A full understanding of that phase would require the Colombian decisions on confinement and release: the reports establish what was reported at the time, not every legal step.

How a number became a certainty

The claim of 110 “proven” murders recurs in accounts published decades later. A recent A&E article even puts it in its headline. Yet research into Ecuadorian records describes four named judgments and 16 proceedings, while contemporary Colombian reporting spoke of 16 minors. This is a substantial disagreement between sources, not a rounding error. Without judgments substantiating 110 convictions, Nocturna does not repeat that claim as fact.

Stories about López’s childhood, psychological labels and proposed causes of his crimes also circulate. They cannot replace records concerning victims or establish why any particular crime occurred. His background may matter to the history of the inquiry, but treating childhood hardship as a necessary cause of violence would be an unsupported inference.

Where the record ends

The sources reviewed here cannot establish his current whereabouts, confirm his death or establish whether an arrest warrant is active today. A 2023 account says he stopped reporting to authorities after 1998 and lists conflicting stories about what followed; none is treated here as an answer.

The firmer documented core is his 1980 arrest; Ecuadorian convictions identified in legal research; the consolidated prison term; release and deportation in 1994; and a Colombian investigation hampered by lost files. The victim total is a separate, unsettled question long blurred by confessions, headlines and repetition. Returning to the names of Amparo, Rosario, Vilma and Aidé, and to investigations without a demonstrable conclusion, restores some of the attention taken from victims and families by the legend of a “monster”.

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