A Japanese father, Kengo Satake has stabbed his 12-year-old son to death after complaining the boy was failing to study for a school entrance exam, reports said on Tuesday.
He told police that he 'argued with his son, Ryota for not studying' before a test to enter a private junior high school, public broadcaster NHK reported.
He was taken to hospital Sunday after the stabbing but died from loss of blood, Aichi prefectural police in the central city of Nagoya told AFP.
The father was arrested after police got a call from hospital staff, he said.
Satake reportedly told police he had stabbed his son 'by mistake.'
The boy's mother was at work when the incident occurred, the Asahi Shimbun daily reported.