The first of the murders he committed took place on 8 February 1996, in Merano, where, with a gunshot to the back of the head, he killed 61-year-old Hans-Otto Detmering, an official for the
Deutsche Bundesbank, and his Italian mistress, 50-year-old Clorinda Cecchetti: both were killed while walking along the
Passer stream. At first, it was thought to be of an economic-patrimonial motive, linked to a private matter of the German banker. It was also suggested to be a crime of passion, for which Detmering's wife was a suspect, but the investigative hypothesis remained unanswered. On 14 February, in the Merano area of Sinigo, a 58-year-old farmer, Umberto Marchioro, was shot in the head near his home. The weapon turned out to be the same one used in the murder of the two lovers; the method of execution was identical. In the face of such evidence, the investigative authority began to formulate the hypothesis that a serial killer could be the culprit. A few days later, a young drug-addicted blogger, Luca Nobile, was arrested on charges of being the perpetrator of the murders. On 27 February, in the centre of Merano, 36-year-old accountant Paolo Vecchiolini was killed while walking with his girlfriend. The method and weapon used for the murder were the same as the previous ones. Despite the shocking attack, the girlfriend managed to provide the investigators with a
facial composite, which described a tall, blonde man in overalls, carrying a rucksack. This new murder led the investigators to resume the murder trial, which exonerated Luca Nobile from any involvement. On the morning of 1 March, another murder took place in Riffian. The victim was a neighbour of the South Tyrolean killer, 58-year-old bricklayer Tullio Melchiorri, who was shot in the forehead. After a series of testimonies and reports, the investigators managed to identify a potential suspect who lived in the area. Near the body of Melchiorri were found two sheets containing sentences in German with racist and delusional content:
"Italian pig, you settled in South Tyrol" and
"I am an Italian emigrant, or Nazi, I am only responsible for infanticide. You have arrived late." (the latter was found by
carabiniers near the crime scene). Gamper had fled and taken refuge in his farm.
Marshal Guerrino Botte tried to approach the hiding Gamper, but was hit with a bullet to the face. After an intervention by
Criminalpol and the
state police, a firefight broke out. The seriously wounded sergeant was transported to a hospital in
Bolzano, where he died shortly after. ==Suicide==