Prosecutors demanded on Monday the death penalty for senior Aum Shinrikyo figure Masami Tsuchiya, who is accused of murder and helping the cult develop chemical weapons.
It has been nearly eight years since Tsuchiya's trial began and he is the last of 192 defendants in cases related to the cult to have a sentence sought by prosecutors.
The Tokyo District Court is expected to hand down a ruling by the end of the year after the defense gives its final argument.