During a visit of the
Pope to a Rome parish, on 15 December 1985, Gregori's mother recognized a man in the papal escort as the person who often enjoyed some time with her daughter at the bar some days before her disappearance. This man was Raoul Bonarelli, the then-deputy chief of the
Gendarmerie of the Vatican City. In 1993, Bonarelli was questioned on the matter by judge Adele Rando but was later dismissed due lack of evidences and due to the fact that Gregori's mother no longer recognized him. In the 2000s, Judge Otello Lupacchini and journalist Max Parisi conducted a study of over twelve cases of young girls missing and murdered in Rome between 1982 and 1990 and hypothesized that all of them were victims of a serial killer, due to the similarities of the murders and their proximity within the city. Some of these include the murders of Katy Skerl and Simonetta Cesaroni, two major unsolved crimes in Italy. Lupacchini and Parisi put forth the theory that both Mirella Gregori and Emanuela Orlandi were victims of this serial killer. According to them, this man lured the girls with job offers, like selling Avon products, and then kidnapped and killed them. Gregori and Orlandi, who were the only two minors on this list of victims, were also the only ones whose bodies were never found. In 2016, while conducting a study on the judicial documents on the Orlandi case, Italian journalist Tommaso Nelli found a document of the
SISDE dated 31 October 1983, of a report made by a SISDE agent who was charged to control the bar under Gregori's home, a bar that was highly frequented by Mirella. On the report, the agent reported a conversation between Sonia De Vito, the daughter of the bar's owners and best friend of Mirella Gregori, who, while talking to another girl said: "Yes, he knew us. We didn't know him. As he took Mirella he could have taken me, since we used to go together". If this SISDE report is true, this implies that Sonia De Vito was aware of the identity of the man who took Mirella Gregori. ==Reopening of the case==