Case overview
Between 1968 and 1985, a serial killer targeted eight couples in the countryside outside Florence, Italy, shooting them with the same .22 Beretta and mutilating female victims in a consistent pattern. Despite recovering ballistic evidence, witness reports, and crime scene connections, Italian investigators pursued multiple suspects across decades without securing a definitive conviction for all murders.
The pattern emerges
The first confirmed attack occurred on August 21, 1968, when Barbara Locci and her lover Antonio Lo Bianco were shot to death in their parked car in Signa, a town west of Florence. Locci’s husband, Stefano Mele, was convicted of the murders and sentenced to 14 years in prison. The case appeared resolved until August 1974, when another couple was killed under nearly identical circumstances in Borgo San Lorenzo, north of the city.
Pasquale Gentilcore and Stefania Pettini were found shot in their vehicle. Pettini’s body had been removed from the car and mutilated with a knife. The weapon was a .22 caliber firearm. Ballistic analysis later confirmed the same gun had been used in the 1968 murders, meaning Mele had not acted alone or had been wrongly convicted.
Over the next 11 years, six more attacks followed the same structure. The killer targeted couples parked in isolated rural areas after dark, typically on weekends with no moon. All victims were shot through car windows. In every case involving a female victim after 1974, the body was mutilated postmortem, often with removal of the left breast and pubic area. The weapon remained consistent across all scenes.
Geographic distribution and victim selection
The crime scenes formed a loose arc around Florence, spanning the provinces of Florence and Pistoia. Locations included Borgo San Lorenzo, Scandicci, Calenzano, and Vicchio, with distances between sites ranging from 10 to 30 kilometers. Each scene was accessible by car but secluded from main roads and residential areas.
Victims ranged in age from 18 to 36 and had no apparent connection to one another. Most were Italian couples, though the final attack in 1985 targeted two French tourists, a deviation in victim nationality but not methodology. Investigators found no evidence the victims knew the killer or had been stalked prior to the attacks. The selection appeared opportunistic, based on location and circumstance rather than personal motive.
The interval between murders ranged from seven months to three years, with no clear seasonal pattern beyond the preference for dark, warm nights when couples were likely to be outdoors. Investigators noted the killer demonstrated familiarity with the rural road network and advance knowledge of isolated parking areas frequented by couples.
Physical evidence and forensic linkage
Ballistic evidence provided the clearest connection across the series. All 67 rounds recovered from crime scenes were fired from the same weapon, a .22 caliber Beretta pistol. The bullets were Winchester series H rounds, manufactured before 1968. This detail became critical when investigators attempted to trace the weapon’s origin.
The mutilations followed a specific sequence. Female victims were removed from vehicles, positioned on their backs, and subjected to cuts that removed breast tissue and portions of the pubic region. Forensic examiners noted the wounds showed a lack of surgical precision but a consistent ritualistic intention. No sexual assault was documented in any case.
Trace evidence included tire tracks, footprints, and fabric fibers, but none produced a conclusive match to a suspect. DNA analysis was not widely available during the active investigation period. Later attempts to apply genetic testing to preserved evidence yielded limited results due to sample degradation and contamination from decades of handling.
Investigative focus and major suspects
Following the 1974 murders, investigators reopened the 1968 case and re-examined Stefano Mele’s conviction. Mele admitted to being present during the 1968 attack but accused others of firing the weapon, naming several individuals including Salvatore Vinci, a Sardinian laborer. Vinci and other men from the Sardinian community in Tuscany became early subjects of scrutiny, but no charges were filed due to insufficient evidence.
In 1982, Enzo Spalletti was arrested after being found in possession of a .22 caliber weapon. He was held for several months but released when ballistics testing confirmed his gun was not the murder weapon. Spalletti was later killed in a separate incident in 1983, fueling speculation he had been silenced, though no evidence supported that theory.
After the 1985 murders, investigative leadership shifted. Prosecutor Pier Luigi Vigna and later Giuliano Mignini pursued theories involving organized satanic groups and conspiracies. This approach led to the 1993 arrest of Pietro Pacciani, a local farmer with a prior conviction for murder. Pacciani was convicted in 1994 based on circumstantial evidence, including testimony from associates and behavioral indicators.
Pacciani’s conviction was overturned on appeal in 1996 due to lack of direct physical evidence linking him to the crime scenes. Two of his acquaintances, Mario Vanni and Giancarlo Lotti, were later convicted as accomplices in some of the murders. Vanni died in prison in 2009. Lotti was released in 2002. Pacciani died in 1998 before a planned retrial, and no individual was ever conclusively tied to all 16 murders.
Breakthroughs and investigative failures
The investigation achieved early success in establishing forensic linkage through ballistics, which definitively connected the crimes and eliminated unrelated incidents. Witness reports provided limited descriptions of vehicles near some scenes, but none led to identification.
Critical failures included the initial conviction of Stefano Mele without recognizing the involvement of additional perpetrators. The delayed recognition that the 1968 and 1974 murders were connected allowed years to pass without a coordinated response. The destruction or mishandling of physical evidence at early crime scenes limited later forensic options.
The most significant investigative misstep was the shift toward conspiratorial theories in the 1990s. Prosecutors pursued satanic cult involvement and alleged cover-ups by public officials, diverting resources from evidence-based leads. Several individuals, including doctors and public figures, were investigated and publicly named without credible evidence. These actions resulted in lawsuits and damaged the credibility of the investigation.
Impact on criminal procedure
The case influenced Italian legal reforms regarding pretrial detention and the use of circumstantial evidence in capital cases. The reliance on informant testimony and behavioral profiling without physical corroboration in the Pacciani trial drew criticism from legal scholars and contributed to later procedural changes.
The investigation also highlighted limitations in inter-agency coordination. Multiple prosecutor offices and police units handled different phases of the case, resulting in fragmented information sharing and duplicated efforts. The Italian government later implemented centralized databases for serial crime tracking in response to these deficiencies.
Unresolved elements
No definitive explanation exists for the three-year gap between the 1981 and 1984 murders, or the seven-year interval before the 1968 attack and the 1974 resumption. Some investigators theorized the killer was incarcerated or deceased during these periods, but no records confirmed this.
The fate of the murder weapon remains unknown. Despite extensive searches of properties linked to suspects, the Beretta was never recovered. Investigators considered the possibility it was destroyed or remains hidden.
The mutilations suggest a ritualistic or symbolic motive, but no evidence of organized group involvement was substantiated. The killer’s knowledge of victim locations and ability to avoid detection for 17 years indicate careful planning, yet no clear geographic or occupational profile emerged that led to an arrest.
Where to look next
- Documentary: “The Monster of Florence” (Investigation Discovery)
- Book: “The Monster of Florence” by Douglas Preston and Mario Spezi
- Book: “A Florentine Death” by Michele Giuttari
