He filmed his request for help and the last moments of Davide Piampiano's life, who died during a wild boar hunt in the countryside of Assisi, the small video camera placed in the hat he was wearing.
And who also recorded what was said about what he had "done" by Piero Fabbri, 57, also on the hunt and now arrested by the carabinieri for voluntary homicide with possible malice.
According to the reconstruction of the investigators, Piampiano's death was not planned from the beginning and for this reason no motive has been hypothesized.
According to the investigations, Fabbri - according to ANSA - allegedly believed he had fired a 12-gauge rifle shot at a wild boar, which instead hit the young man in the chest.
So much so that the suspect was the first to reach him and - it emerges from the GoPro images - to accept his request for help while he was desperate for what was "done".
However, it was Fabbri's subsequent behavior that led to the hypothesis of voluntary homicide.
In fact, the man is accused of having tried to sidetrack the investigation by altering the state of the places, unloading the twenty-four-year-old's weapon, getting rid of his rifle and hunting jacket and above all "failing to call promptly" for help, notified after several minutes by another young man who was hunting and who had arrived in the meantime.
"This omissive behavior - explained the investigators, coordinated by the prosecutor Raffaele Cantone - made it possible to hypothesize the intentional hypothesis of homicide against the author of the shot, since he, with his choice not to immediately call for help, ascertained the risk that the affected person could die".
Among the elements that still need to be investigated, however, is the lethality of the blow that hit Piampiano.
That is, if any timely treatment could have saved his life.
However, it is not excluded that the Florence judiciary is called to deal with the investigation.
The victim's mother is in fact an honorary judge and therefore this automatically triggers the jurisdiction of the Tuscan investigators.