Poisoning death of 4-year-old child Suspect's sister may have also been murdered; re-arrested on suspicion of murder. Suspect Kenichi Hosoya's older sister Minako Hosoya (41 at the time) died suddenly in her home six years ago in April 2018, and the Metropolitan Police Department is currently investigating the circumstances surrounding her death.
In March last year, company executive Kenichi. Hosoya and his wife Shiho Hosoya from Taito Ward, Tokyo, exposed their second daughter. to harmful chemicals found in car antifreeze.