A 48-year-old rightwing extremist pleaded guilty Tuesday to stabbing to death Diet member Koki Ishii of the Democratic Party of Japan.

In the opening session of his Tokyo District Court trial, Hakusui Ito, representative of the rightwing group Shukojuku, said he had nothing to add to prosecutors' account that he murdered Ishii, 61, on Oct. 25 with a kitchen knife in front of the lawmaker's house in Setagaya Ward, Tokyo.

Ito, wearing a bright yellow jacket, occasionally glared at the gallery while prosecutors read the indictment. He sometimes yawned and closed his eyes as if he was napping.