... years before Mignini began making his case against Knox, the Italian prosecutor was involved in another high-profile murder case. His work on that case, some say, raises serious questions about his methods and his judgment.
The case revolved around murders in the 1970s and 80s, when 16 bodies were found in the hillsides outside Florence, Italy. The killer was nicknamed the Monster of Florence. He killed young lovers often as they made love in the Tuscan foothills at night -- murders that included horrific, ritualistic mutilations.
Arrests were made in the murders but the killings continued while the suspects were in custody.
American author Douglas Preston, who co-authored a book on the case with Italian journalist Mario Spezi, said the killer's profile was clear.
"Every single forensic examination of the evidence, every single psychological profile, everything said that this was a lone psychopathic sexual killer who worked by himself," he said.
Decades passed with no resolution and then, in 2002, Mignini re-opened the case. He didn't buy into the lone psychopathic killer theory. Instead, he claimed, the murders were the work of a satanic sect, dating back to the Middle Ages, that needed female body parts for their black masses, to serve as the blasphemous wafer...