The boy’s arrest was in connection with her death, the family’s attorney Lorenza Dordoni confirmed on Tuesday.
The victim, Auroroa, died after allegedly falling from the eighth floor of her apartment building.
In recent days the 22-year-old sister of Aurora said on social media she did not believe her sister had committed suicide or had fallen from the balcony in an accident.
“The mother cried and said she considers her suspicions to be confirmed now,” said Dordoni after the teen’s arrest.
Autopsy results are expected in the coming days, but an external examination of the teen’s body revealed an important head injury which will be analysed by forensic experts, investigative sources said.
They will determine whether it is compatible with the impact of a fall or whether it could have been determined by other causes, like a previous trauma.
The exam was conducted on Monday in Pavia by a pathologist appointed by Bologna juvenile prosecutor Giovanni Cecchetto, who has ordered other tests, including a CT scan and genetic tests.
Meanwhile, investigative sources and press reports said eyewitnesses, including a teen girl, reportedly contacted Autora’s family saying they had seen her being abused by her boyfriend prior to her death.
In one instance, a witness said she saw a girl on October 4 being shoved by a boy, later identifying her as the victim.
Rome daily La Repubblica reported that a video was filmed showing the 15-year-old boyfriend hitting Aurora.
ANSA