The Tokyo District Court sentenced a 23-year-old man Tuesday to seven years in prison for killing his sister but acquitted him of dismembering her corpse, ruling he was legally insane when he committed that part of the crime.
Yuki Muto, a former cram school student, was found guilty of suffocating his sister, Azumi, 20, in December 2006.
But presiding Judge Yasuhiro Akiba ruled that Muto experienced dissociative disorders after the murder, triggering disruptions in his perception and identity at the time he cut up the corpse.