October 9, 1990 - Takahiro Shiraishi
Shiraishi exploited social media to target individuals in psychological crisis, presenting himself as willing to assist with suicide pacts before abducting, assaulting, and killing them. The case drew particular attention to the vulnerabilities created by anonymous online platforms and the ease with which expressions of suicidal ideation could be weaponized. Nine victims were found dismembered in his Zama apartment in 2017, and the investigation prompted significant public debate in Japan about platform responsibility and crisis intervention.
From Wikipedia
Takahiro Shiraishi (白石隆浩, Shiraishi Takahiro; 9 October 1990 – 27 June 2025) was a Japanese serial killer and rapist. He was also known as the Twitter Killer or the Zama Suicide Pact Killer, which he was labeled as in most media reports at the time of his sentencing. In Zama, Kanagawa, between August and October 2017, he murdered nine people, eight of them being young women, including three high school girls, in an incident known as the Zama Nine Murders.
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