An investigation was launched after the woman?s older brother reported her missing to the Takao Police Station in western Tokyo on October 24.
A man in custody following the discovery of parts of nine corpses in his apartment in Zama City has told police that he disposed of portions of the bodies in the trash, reports the Sankei Shimbun (Oct. 31).
The police initially found two heads inside a cool box at the entrance of the apartment and later discovered several other body parts kept in cool boxes and covered with cat dung.
An examination of security camera footage taken at Odakyu Sobudai-Mae Station, which is located near the residence, on October 23 shows the woman with the man.
Tokyo's Metropolitan Police Department on Tuesday arrested the apartment's resident, Shiraishi Takahiro, 27, on suspicion of abandoning bodies sometime between August 22 and Monday.
Kyodo news agency said the missing girl is believed to have come into contact with Shiraishi via Twitter, after she posted the message: "I want to die but doing so alone is bad". Shiraishi allegedly told the police he cut up the bodies up in the bath, disposing of some body parts in the garbage. The brother later learned of the suicide site after logging in using her name and password, leading to the discovery that she had been in touch with the suspect. She agreed to contact Shiraishi and to invite him to meet her at a train station while the police observed.
Severed heads were found in coolers, according to the AP.
"I thought it smelled like sewage", one neighbor said.
"I killed them and did some work on the bodies in order to hide the evidence", the suspect told police, according to Fox News. A man who lured three people he found on a suicide message board in Osaka was convicted of killing them in 2005 and was given the death sentence.
Although Japan has one of the lowest crime rates in the world, it has seen some high-profile killings recently.