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Media reports quoted investigative sources as saying Shiraishi started killing as soon as he moved into his apartment in late August.
His first victim was another woman whom he got in touch with via Twitter, offering to assist her suicide wish, then killing her boyfriend to silence him, according to the media reports, including NHK public television.
They said Shiraishi used similar tactics to kill seven other women, four of them teenagers.
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Shiraishi threw out some of the body parts as rubbish, along with the victims' belongings, reports said.
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The woman's brother reported her disappearance to police the next day.
When he sought information about his sister's disappearance on Twitter, an unidentified woman replied that she had met Shiraishi and agreed to cooperate with police by setting up a fake appointment.
Two investigators then followed Shiraishi back to his apartment and knocked on the door, public broadcaster NHK said.
When they asked him if he knew where the missing woman was, Shiraishi pointed to one of eight coolers, saying "She is in here", NHK said, quoting investigative sources.
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