Borsellino was one of the most important figures in Italy's fight against the mafia and his death spurred campaigners on in the effort to bring the groups to justice. He and his colleague Giovanni Falcone, who was killed by a car bomb two months earlier, have become a symbol of anti-mafia efforts and their faces often adorn posters used in protest marches.
Both were part of Sicily's Antimafia Pool, a group of magistrates set up to investigate Sicily's mafia to share information and prevent any one investigator becoming the sole target of the group. The pair had also grown up together in the same neighbourhood, and Falcone recalled how they played ping pong and football games as boys -- sometimes against classmates who would grow up to become infamous members of mafia clans.
The mafia regularly threatened, attacked and killed magistrates, and the members of the Antimafia Pool lived under constant police surveillance for their own protection. On July 19th 1992, a Sunday, Borsellino began the day with his family at their summer house outside Palermo. After having lunch, the magistrate was driven to Palermo's Via D'Amelio to meet his mother, escorted by two police cars.
Outside his mother's house on the now infamous Via d'Amelio, a parked Fiat had been loaded with TNT and exploded when Borsellino arrived. The magistrate was killed, as were five of the six police officers working to protect him that day: Emanuela Loi, Agostino Catalano, Vincenzo Li Muli, Walter Eddie Cosina and Claudio Traina
Antonino Vullo, the sixth member of the escort, survived thanks to the fact he was parking a car at the time of the explosion.
Borsellino was offered a state funeral, but his widow Agnese refused to accept this -- she accused the government at the time of failing to protect her husband. She asked that no politicians attend the private funeral, and thousands of members of the public protested at Palermo's prefecture over the magistrate's death.
Demonstrators wave Borsellino's book during an anti-mafia protest in 2010. Photo: Tiziana Fabi/AFP
Both before and since his death, Borsellino was widely praised for his work, including by the UN's anti-crime chief speaking on the 20th anniversary of the Via d'Amelio bomb.
Italy's politicians paid tribute to Borsellino, with Italian President Sergio Mattarella -- a Sicilian who entered politics after his brother was murdered by the Cosa Nostra -- said Borsellino's work "constituted milestones in the fight against the mafia in Sicily".
Across Sicily and all of Italy, further initiatives were taking place on July 19th to pay tribute to Borsellino and his police escort, including trees planted in their memory, a minute's silence at the time the attack took place, readings and speeches.
Questions remain over the murder today, including the disappearance of the book the magistrate was writing, known as the Red Agenda, from the crime scene. The investigation has also been hampered by unreliable testimonies from ex-mafiosi.
In an open letter published by Repubblica this week, Borsellino's daughter Fiammetta posed 13 questions about her father's death, including the question of his book and why his police protection was not increased following similar killings.
Mattarella said on Thursday that Italy would honour his memory by "not stopping to search for the truth about the Via d'Amelio massacre".
Prime Minister Giuseppe Conte echoes this words, saying the search for the truth was a "duty for Italy".
In 2017, the Cosa Nostra's so-called 'boss of bosses' Toto Riina -- who ordered the killing of Falcone and Borsellino -- died in prison. The Italian parliament's anti-mafia commission warned that this "paradoxically" strengthened Italy's mafia by allowing a successor to take over. This was not possible while Riina was alive due to the clan's internal hierarchies, but his efforts to direct the criminal group were hindered by his imprisonment.
Meanwhile, Italian anti-mafia experts have warned this year that the groups are "globalizing" by spreading north and across the globe.
The 2018 anniversary of Borsellino's murder comes days after an important anti-mafia operation which saw more than 30 arrests across Italy, targeting members of the Casamonica clan in Rome and Calabria.