When the husband therefore saw that this had not helped him in gaining the dowry, he decided to go back to his own country, leaving the care of his case in the hands of his brother, the Abate, who was in the service of a Cardinal. But although the Abate tried by many a turn to succeed in his intent before the tribunals, he could not achieve it. Hence he also decided to leave Rome. And he was spurred all the more by its becoming known that his sister Pompilia was with child. For this reason, the Governor of Rome had constrained him to consent that she should keep her own home as a prison, under security of 300 scudi to present herself at every demand of the Tribunal. The Abate indeed was unwilling to give his consent unless Pietro Comparini should first assume obligation, by an official document, to furnish her with food. And then, when he had obtained the permission of his Cardinal, he sold his furniture and books, and when he had made them pay over the 47 scudi which had been found upon Pompilia at Castelnuovo, he left Rome. After that Pompilia bore a son, whom she named Gaetano, after the saint to whom she made her vows.

Franceschini, who was now overwhelmed with manifold troubles, and was urged on now by honour and again by self-interest to take vengeance, at last yielded to his base thoughts and planned to kill his sixteen-year-old wife and her parents. When four other criminals had been admitted to the scheme, he left Arezzo, and on Christmas eve reached Rome. He stopped at Ponte Milvio, where there was a villa of his brother. There he remained in hiding with his followers until a time opportune for the execution of his designs should come.

They spied out all the ways of the Comparini family, and on January 2, which was Thursday, at about seven o'clock in the evening, he approached the Comparini home with his companions. He left on guard at the street door Biagio Agostinelli and Domenico Gambassini, and knocked at the door. When he had said that he brought a letter of Canon Caponsacchi from Civita Vecchia the door was opened to him. Immediately this cut-throat Franceschini, assisted by the other two criminals, leaped upon Violante who had opened it and struck her dead to the ground. Pompilia in this crisis extinguished the light, hoping thus to escape the assassins, and ran to the neighbouring door of a locksmith crying out for help. But when she saw that Franceschini was provided with a lantern she went to hide under the bed; but she was dragged from there, and was barbarously slain with 22 wounds by the hand of her husband. Not content with that, he dragged her to the feet of Comparini, who was likewise wounded by one of the other assassins, and was crying out "confession."

When the uproar of this horrible slaughter was heard abroad, people ran thither, but the criminals succeeded in escaping. But in their haste one of them left his cloak, and Franceschini his cap, which betrayed him afterward. The unfortunate Francesca Pompilia, under the burden of such wounds as those with which she had been cut to pieces, implored the Holy Virgin for the favour of confession, and obtained her prayer. Hence she survived some little while, and was able to tell about this horrible crime. She told that after the deed was done her husband had asked of one of the cut-throats who had done the murder with him, if she were indeed dead. When that one had assured him, he replied: "Let us lose no time, but return to the vineyard." And so they made their escape. In the meantime the police had been summoned, and came with a captain. A confessor was quickly called and also a surgeon who gave his attention to the luckless girl.

When the Governor had been informed of the outcome, he immediately despatched Captain Patrizi to arrest the criminals. When the posse arrived at the vineyard, he found that these were no longer there, but that about an hour ago they had left in the direction of the highway. Then Patrizi followed without interrupting his journey, and when he had reached the inn he learned from the host that Franceschini had demanded horses with threat of violence, but they had been denied him, because he lacked the necessary order. Hence he had travelled afoot with his companions toward Baccano. Patrizi continued his march, and, after taking the necessary precautions, arrived at the tavern of Merluzza. There he found the assassins, who were straightway arrested. On them were found, still stained with blood, those daggers with which they had done the murders, and upon Franceschini were found 150 scudi in money. This arrest indeed cost the life of Patrizi, because having been overheated and wounded with a slight scratch he died in a few days.

Franceschini's dagger was of a Genoese pattern, triangular, and with certain hooks made in such a way that in wounding they could not be drawn from the wound without such laceration as to render the wound incurable.

When the criminals were known to be at Ponte Milvio, in that very inn they were heard on their preliminary examinations by notaries and judges sent there expressly, and satisfactory confession was had.

When the capture of the delinquents was known in Rome, a countless throng of people rushed thither to see them, while all the criminals were tied to their horses and conducted to Rome. It is told that Franceschini, while making the journey, asked one of the officers how in the world the crime had ever been discovered. And when he was answered that his wife, whom they had found still living, had revealed it, he was so astounded that he was, as it were, deprived of his senses. About five o'clock in the evening they reached the prisons. A certain Francesco Pasquini, of the town of Castello, and Alessandro Baldeschi of the same town, both of them 22 years old, along with Guido Franceschini had been the slayers of the Comparini. And Gambassini and Agostinelli were those who had stood guard at the street door.

In the meantime there were exposed in San Lorenzo, in Lucina the bodies of the assassinated Comparini, who were so disfigured, and especially the wife of Franceschini, by wounds in the face that they were no longer recognisable. The unfortunate Francesca, when she had taken sacrament and had pardoned her murderers, and had made her own will, died, not yet having completed her seventeenth year. This was on the 6th, which was the day of the Epiphany. She was able to justify herself against all the calumnies inflicted by her husband. The surprise of the people at seeing the said bodies was great, because of the atrocity of the deed, which truly made them shudder, seeing that two old septuagenarians and a young girl of 17 years had so wretchedly perished.

As the trial of the criminals advanced, there were many arguments made on the matter, laying stress on all the more aggravating circumstances which accompanied this horrible massacre. Others also were made in the defence with much erudition, especially by the Advocate of the Poor, who was a certain Monsignor Spreti. He succeeded in delaying the sentence, because Baldeschi made denial, even though "the cord" was administered to him twice, under which he swooned. Finally he confessed, and the others did likewise. They also revealed that they had planned to kill Franceschini himself, and to rob him of his money, because he had not kept his word to pay them as soon as they left Rome.