Between July 1992 and March 1993, an unidentified attacker killed three women in and around Lisbon, Portugal, in a case Portuguese media termed the Lisbon Ripper (O Estripador de Lisboa). Each victim was disembowelled and had internal organs removed; investigators believed the mutilations were carried out with a sharp instrument other than a knife, possibly a scalpel. All three women were young, dark-haired, and named Maria, and each was reported to have worked as a prostitute, with some accounts describing drug use as well.
The first victim, 22-year-old Maria Valentina — known as "Tina" — frequented the area around Avenidas Novas and Avenida Cinco de Outubro. Her body was found on July 31, 1992, in a cabin in Póvoa de Santo Adrião; she had been strangled as well as disembowelled. On January 27, 1993, railway construction workers discovered the body of the second victim, 24-year-old Maria Fernanda, in a cabin in Entrecampos, Lisbon; her breasts had also been cut off. The third victim, 27-year-old Maria João — a friend of Valentina’s — was found on March 15, 1993, near the site of the first killing; nearly all of her organs had been removed.
Portugal's Polícia Judiciária led the inquiry, at times drawing on a drug-trafficking unit's night-surveillance brigade, and received numerous anonymous calls and letters, none of which produced solid evidence. Investigators found little physical evidence at any of the three scenes — no blood other than the victims', no hair, footprints, fingerprints, or glove material. A medical examiner who autopsied the first victim, named in source reporting as Jose Sombreirero, said he had never seen comparable injuries in decades of practice and concluded the attacker likely rendered each woman unconscious with blows to the head before the mutilation began. Investigation coordinator João de Sousa said police had informal leads connecting several people to the victims but nothing sufficient to arrest or question anyone.
In March 1993, two FBI agents traveled to Lisbon to compare the killings with a 1988 series of murders in New Bedford, Massachusetts — a city with a large Portuguese community — under a theory that the perpetrator had once lived there before returning to Portugal; a few days after the agents' visit, Portuguese police arrested and then released another suspect for lack of evidence, and no connection between the two cases was substantiated. Portuguese investigators also noted broadly similar killings reported between 1993 and 1997 in the Netherlands, the Czech Republic, Denmark, and Belgium and speculated that the perpetrator might have been a long-haul truck driver, though none of those cases were solved and no link was confirmed.
In November 2011, Portuguese media identified a man as a possible suspect after his son referenced the killings in an application for a reality-television program, drawing renewed police attention. A comparison of a palm print recovered from one scene did not match the man, and investigators concluded he was not the Lisbon Ripper; he was released from custody in 2013 for lack of evidence in a separate matter. Under Portugal's Penal Code, the 15-year statute of limitations on the killings lapsed in 2008, meaning that even if the perpetrator were identified, prosecution would no longer be legally possible. The case remains unresolved, and the identity of the person responsible for the three killings is unknown.