4-year-old dies from poisoning; father explains to those around him that he died from an unknown seizure. He was arrested on suspicion of murdering her by ingesting her with ``ethylene glycol'' and the antipsychotic drug ``olanzapine.'' In response to the investigation, suspect Kenichi has denied the charges, and suspect Shiho has remained silent.
The Metropolitan Police Department will investigate the actions of the suspect couple before and after the second daughter's death, and will also investigate the circumstances surrounding her sister's death.