Seiichi Endo (遠藤誠一, Endō Seiichi; 5 June 1960 – 6 July 2018) was a Japanese terrorist and Aum Shinrikyo member who was executed for his participation in the 1995 Tokyo subway sarin attack and a number of other crimes. He produced the Sarin gas for the attack after leader Shoko Asahara told him to do so.
Source: “Seiichi Endo”, English Wikipedia (CC BY-SA 4.0), excerpt