The case gained international infamy through the work of American author Douglas Preston and Italian journalist Mario Spezi. Spezi had covered the case for La Nazione for decades, getting closer than any journalist to the truth.
The ritual of the murders was almost always the same: the killer shot the male partner first, then turned on the woman. In at least half of the cases, the violence did not end with death. The Monster used a knife to excise large portions of skin surrounding the female victims' sexual organs, and in two instances also cut off a breast. A fragment of one victim's breast was even mailed to the only female member of the investigative team. This unique and gruesome signature led some to call him "The Surgeon of Death".
Forensic technology has advanced. In 2022, the Florence Prosecutor’s Office reopened a small section of the file to re-test a single hair found on the body of Nadine Mauriot in 1985. The result, as of 2024, remains sealed.
Early on, investigators focused on the "Sardinian Clan," a group of immigrants linked to the 1968 Locci murder. Several suspects were arrested, only for new murders to occur while they were behind bars, forcing their release. Il Mostro Di Firenze -The Monster Of Florence- ...
French couple Nadine Mauriot and Jean Michel Kraveichvili became the last victims. Their murder would later yield a crucial piece of evidence: a bullet lodged in a tent cushion, discovered in 2015, that decades later would reveal an unknown DNA profile. Then, as mysteriously as it began, the killing stopped.
Six more couples were murdered. Starting in 1974, the killer began a ritual of mutilating female victims , a signature that horrified the public.
Stefano Baldi and Susanna Cambi are shot and mutilated. The case gained international infamy through the work
Claudio Stefanacci and Pia Rontini are murdered in a Fiat Panda. Rontini suffers severe pelvic and breast mutilations.
Authorities then switched to a theory of a collective of killers, known as the Compagni di Merende . Two men, and Giancarlo Lotti , were eventually convicted, but critics, including journalist Mario Spezi and author Douglas Preston, argue these convictions were flawed, potentially miscarriages of justice, notes The Wall Street Journal . Conspiracy and the "School of the Red Rose"
Contrary to his nickname, none of the murders attributed to the Monster of Florence took place within the city of Florence itself. Instead, the killings occurred in the secluded pine forests, olive groves, and lover's lanes that dot the rolling hills around the Tuscan capital. The Monster's method of operation was diabolically consistent. In at least half of the cases, the
Antonio Lo Bianco and Barbara Locci are shot dead in their car. Locci’s six-year-old son is asleep in the back seat but left unharmed. Locci's husband, Stefano Mele, is initially convicted of the crime out of jealousy, but the later discovery of matching ballistics reveals he could not have acted alone or committed the subsequent murders.
Some theories allege involvement of high-ranking officials, Freemasons, or members of the secret Gladio network.
Following Pacciani's death, his associates, Lotti and Vanni, were convicted of several of the killings, with Lotti confessing and receiving a 26-year sentence, while Vanni received life imprisonment.
Critics argue Lotti was mentally unstable and coached by prosecutors.