Aum Shinrikyo cultist Tomomasa Nakagawa filed an appeal Wednesday against the death sentence he received from the Tokyo District Court last week for his role in two deadly sarin gas attacks and the murder of a lawyer and his family.

On Oct. 29, the Tokyo District Court sentenced Nakagawa, 41, to death for conspiring with Aum founder Shoko Asahara, 48, whose real name is Chizuo Matsumoto, to commit the crimes.

The court said there was no option but death for Nakagawa, considering his responsibility for making the sarin at the behest of Asahara, and his role in the slaying of 25 people.