Takahiro Shiraishi

Takahiro Shiraishi
白石隆浩
Born(1990-10-09)9 October 1990
Died27 June 2025(2025-06-27) (aged 34)
Tokyo Detention House, Tokyo, Japan
Cause of deathExecution by hanging
Other namesTwitter Killer
Zama Suicide Pact Killer
Criminal statusExecuted
Motive
ConvictionAggravated murder (9 counts)
Criminal penaltyDeath
Details
Victims9
Span of crimes
22 August – 17 October 2017
CountryJapan
LocationZama, Kanagawa
Date apprehended
31 October 2017

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.