The death sentence for Masami Tsuchiya, a former senior member of the Aum Shinrikyo cult who was convicted over a series of crimes committed by group members, has become final, judicial sources said Tuesday.

The sentence was finalized after the Supreme Court on Monday rejected an objection by Tsuchiya to a top court decision last month that upheld lower court rulings.

Tsuchiya, 46, is the 11th Aum member to be sentenced to death. He was convicted of involvement in six Aum-related criminal cases, including deadly sarin gas attacks in the mid-1990s.