Prosecutors on Thursday sought a life sentence for Toshiya Fujita, a senior member of a crime ring behind a series of robbery and fraud cases across the country.

The lay-judge trial for 41-year-old Fujita at the Tokyo District Court, presided over by Judge Sakon Togari, concluded with the defense’s final arguments. The verdict is set to be handed down on Feb. 16.

On Thursday, the prosecution stated in their closing arguments that Fujita was aware of the use of a crowbar in the fatal assault of a 90-year-old woman in the city of Komae, western Tokyo, in a high-profile robbery — one of the series of cases.