病気(びょうき)の苦痛(くつう)から自殺を(じさつを)図ったが(はかったが)死にきれず(しにきれず)、深く(ふかく)苦しんでいた(くるしんでいた)から

Shobei was impressed by Kisuke's lack of greed, and next asked the reason why he killed his younger brother. Shedding tears, Kisuke answered, 'My brother, who was suffering from illness, tried to commit suicide by cutting his own throat with a razor. However, he couldn't die and begged me, "Please pull out this razor quickly and ease my pain."'