This is what we found on Wikipedia regarding the Monster Florence:

The Monster of Florence (Italian: Il Mostro di Firenze) is the name commonly used by the Italian media for a non-definitively identified serial killer active within the Metropolitan City of Florence between 1968 and 1985. The Monster murdered 16 victims, usually young couples secluded in search of intimacy, in wooded areas during new moons. Several connected persons have been convicted for involvement in the murders, yet the exact sequence of events, the identity of the main actor and the motives remain unclear.

Law enforcement conducted several investigations into the cases over several years. In 2000, courts convicted two individuals for four of the double homicides. They had been charged with being part of an alleged group of murderers which became known in the popular press as the "Snack Buddies" (Compagni di merende), following the notorious and absurdly comical courtroom protestation of one of the suspects that the group were merely friends who on frequent occasion innocently consumed "snacks" together in local bars and restaurants. Multiple weapons were used in the murders, including a .22 caliber Beretta handgun and a knife, and in half of the cases, a large portion of the skin surrounding sex organs was excised from the bodies of the female victims.