A couple were found slain on a street in Narashino, Chiba Prefecture, early Wednesday and their son, who apparently killed them, was discovered lying dead nearby after thrusting a kitchen knife into his chest, police said.
The three were identified as Kunio Oshio, 55, his 52-year-old wife, Mitsuko, and their 22-year-old son, Takeshi. All three were pronounced dead at a local hospital.
The son is suspected of having committed suicide after stabbing his parents to death, and police said they plan to turn the apparent murder-suicide case over to prosecutors and investigate to determine the motive.