
Volume 28 · Chapter 4
The Monster of the Andes
Pedro Alonso López
Case at a glance
- When
- Late 1970s to 1980; arrested in 1980
- Where
- Ambato, Ecuador, with killings also in Peru and Colombia
- Perpetrator
- Pedro Alonso López
- Outcome
- Sentenced in Ecuador in 1980 to 16 years, released in 1994; released from a Colombian psychiatric hospital in 1998; whereabouts unknown since 1999
The case
Pedro Alonso López was born in 1948 in Tolima, Colombia, and said he was thrown out of the family home as a small boy. By his own account he began killing girls in Peru in the late 1970s, then moved through Colombia and Ecuador, taking children from markets and roadsides.
In March 1980, in the Ecuadorian market town of Ambato, a vendor screamed when she saw a stranger leading her daughter, about ten, away from the stalls, and the crowd held him for police. Soon afterward floodwater near the town exposed the bodies of four girls. López said nothing until officers planted an undercover policeman in his cell for weeks; he then boasted of murders in three countries and offered to show them the graves. He led them to the remains of 53 girls, and claimed over 300 in all. Ecuador’s maximum sentence then was 16 years, and that is what he got.
Released in August 1994 after 14 years, López was handed to Colombia to face a charge over a child’s murder. A court found him not criminally responsible and committed him to a psychiatric hospital. In February 1998 doctors declared him sane, and he walked out after posting a small bond. He renewed his identity card in Bogotá in 1999. In 2002 Colombia sought him through Interpol over another child’s death. No confirmed sighting has been reported since.
Read the full story
This case is told in full in True Crime Case Histories, Volume 28 by Jason Neal.
Get Volume 28 on AmazonCase photographs
3 photos


Where it happened
Why this case
“I usually avoid cases where the body count is the whole story, but this one is really about the system that let him go. A man who admitted to more than a hundred murders served fourteen years and was released on a promise to check in monthly. Readers should watch the paperwork, not the monster.”
— Jason Neal, author of True Crime Case Histories










