The Tokyo District Court on Tuesday sentenced a man dubbed Japan's "Twitter killer" to death for the 2017 serial murders of nine people who posted suicidal thoughts on social media.

Takahiro Shiraishi, 30, was found guilty in the high-profile case by the Tachikawa branch of the Tokyo District Court of murdering, dismembering and storing the bodies of the nine in his apartment in Zama, Kanagawa Prefecture.

Presiding Judge Naokuni Yano ruled that the nine victims did not consent to being killed, and that Shiraishi was mentally fit to be held responsible for the murders.