A man convicted of murder for killing and dismembering nine people in his apartment near Tokyo was executed on Friday, Japan’s Justice Ministry said.

Takahiro Shiraishi, known as the Twitter killer, was sentenced to death in 2020 for the killings in 2017 of the nine victims, most of whom had posted suicidal thoughts on social media. He was also convicted of sexually abusing female victims.

Investigators said Shiraishi approached the victims via Twitter, offering to assist them with their suicidal wishes. He killed the eight women, including teenagers, after raping them, and also killed a boyfriend of one of the women to silence him.