Suspect met the boy via a social-networking service, police said
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Woman suffered a wound to the abdomen that will require two weeks to heal, police said
Suspect told police, 'He woke me, I got irritated and stabbed him'
Suspect told police, 'I only thought that she might have died shortly before the police arrived'
Decayed body of the man was found hanged along a river in Adachi Ward last week
Suspect denied the allegations, telling police that he 'didn't do it'
Suspect does 'not recall' the matter, police said
Suspect told police, 'it might have slipped into my luggage as I hurriedly packed'
Near where the son was found collapsed a knife was discovered nearby, police said