Mario Spezi was born on July 30, 1945, and died on September 9, 2016.

He was an Italian journalist and author.

Mario Spezi wrote the non-fiction true crime book The Monster of Florence with American author Douglas Preston.

Also to that, he was credited by Preston for providing details used in the novel Brimstone.

He spent much of his career tracking the case of the notorious serial killer known as the Monster of Florence.

Mario Spezi was even jailed on charges of impeding the investigation by prosecutor Giuliano Mignini, though the charges were overturned on appeal.

Then, later, he even apologized to Amanda Knox and Raffaele Sollecito in the case of the murder of Meredith Kercher, another of Mignini’s cases.

He also wrote the film Il Mostro Di Firenze (1986), based on his novel.

However, the film aired in Italy and the United States.

He was a Roman Catholic.

Mario Spezi passed away at 71 years old.