Suspect said, ‘I told her I'd pay her for sex in the car’
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Woman said she feared that the child's birth and death would be revealed to her husband
Woman's body showed no signs of external wounds
School said, 'We would like to take measures such that this will never happen again'
Yoshihito Mizumoto fatally stabbed Satomi Ishizawa in Koshigaya City last September
Police are investigating the circumstances that led to the event
Three are believed to have inhaled carbon monoxide fumes
No personal items that could assist in his identification were found at the scene
Person is believed to be in their 40s to 70s
Case is being treated as a suicide or the result of an accident or foul play