4-year-old second daughter dies from poisoning ``I thought she was sleeping'' Mother explains before arrest. Kenichi Hosoya (43), a company executive in Tokyo's Taito Ward, and his wife Shiho Hosoyas (37) exposed their second daughter, Miki, to poisonous antifreeze in their car.

The Metropolitan Police Department is investigating, suspecting that Miki had been left alone for a long time after her condition deteriorated. In response to the investigation, suspect Kenichi has denied the charges, and suspect Shiha has remained silent.