The killer of girls was exposed from the DNA of an adulterous father

DNA analysis and record technology helps police find the culprit who brutally murdered a 13-year-old girl after six years of investigation in Italy.

In November 2010, 13-year-old girl Yara Gambirasio on the way home from school in Brembate di Sopra, Italy, was kidnapped and brutally beaten. The body with many of her wounds was found three months later, buried in the snow in a field near her home, according to the Guardian.

Police Italy led dogs with field investigation.(Photo: Spada).

After examining the scene, police found a DNA sample of a man on the victim's body, along with fibers from a car. Police immediately launched a large-scale DNA reconciliation campaign, with 18,000 DNA samples of people living around the scene being collected.

Police found the suspect's DNA samples almost coincided with a specimen collected from the Guerinoni family living in the town. However, what shocked them was that the specimen was Giuseppe Guerinoni, who died 11 years earlier, causing the police to grave Giuseppe in 2013 to verify.

The case seemed to be deadlocked when Guerinoni was dead, his children were all girls, there was no son. Italian media call this one of the most difficult cases in the history of the judiciary.

However, investigators still did not give up and suggested that Guerinoni had an illegitimate son whose authorities did not know. They called this suspect "Anonymous 1".

Italian police check alcohol content to secretly collect DNA samples of objects.(Artwork: BI).

Italian police have documented 532 women who can know Giuseppe while alive, zoning their sons and conducting a secret campaign to collect DNA samples of these men to find out " Anonymous 1 ". The police arranged alcohol testers, asking them to blow on the test machine to secretly collect DNA samples from saliva.

The tragic thing is that these DNA tests also reveal many other out-of-network relationships, with many illegitimate children being found in the region.

By June 2014, after a while of screening subjects and analyzing the DNA samples collected, the new police identified the suspect as Massimo Bossetti , 46, a local construction worker. Results of DNA analysis showed that he was Giuseppe's son with Ester Arzuffi, a married woman who always denied the relationship with Giuseppe.

Massimo Bossetti, 46, an assassin murdered a 13-year-old girl.(Photo: Spada).

Massimo was arrested and prosecuted in June 2015, but repeatedly petitioned."I can be ignorant, uneducated but not a killer , " he denies crimes before the trial of conviction and challenges to implicate scientific evidence.

However, the DNA test results convinced the jury. In July 2016, the Bergamo court sentenced Massimo to life for murder, ending a complicated six-year case with the largest DNA test campaign.