Takahiro Shiraishi was executed for the killings in 2017 of nine victims, most of whom had posted suicidal thoughts on social media.

Japan has executed a man dubbed the “Twitter killer,” who was convicted of murdering and dismembering nine people, mostly women, in the country’s first use of capital punishment in nearly three years.

Takahiro Shiraishi was put to death on Friday, eight years after body parts were found in coolers at his home outside Tokyo. It was Japan’s first execution in years.