After Li Congcong's parents stopped him going to an internet café, the 17-year-old poured pesticide into some cabbage soup. His mother and father were dead within hours after lunch. Mr Li will be more than 30 when he is released from prison.
His story is just one of 30 chilling tales told in Who Took Our Children?, a documentary that recently started showing in Jiyuan, Mr Li's hometown in the central Chinese province of Henan.
The 45-minute film was produced by the local prosecutors' office, drawing on police and court files. Although Jiyuan is better known for the hundreds of children discovered this summer to be suffering from lead poisoning, the film pinpoints the internet as the scourge leading kids astray and tearing families apart. It is a sign of the desperation felt by the authorities over social problems among the youth that officials are increasingly blaming on “internet addiction”.