Suspect used a knife to stab the girl, 11, in the neck at an outlet of chain Daiso on Sunday
TokyoReporter
Man suffered blows to the head; police found burned charcoal briquettes in the trunk of the vehicle
Suspect told police, 'The boy said that he was troubled and came over'
Skeletal remains were found wrapped in a futon that was dumped among bags of trash and kitchen garbage on December 21
Suspect was in possession of a blood-stained knife at the time of his arrest, police said
Body was found floating in shallow water of the Katsura River on Monday
The celebrity garnered popularity as a television commentator after a career in the adult video industry
Tampons were unused, police said
Body showed no signs of external injuries, police said
Gender and approximate age of the person are not known, police said