Tetsuya Shiroo died in a medical prison in Osaka Prefecture on Wednesday
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Read the latest stories on Japan’s criminal underworld
Two syringes were found under the brake pedal of the vehicle driven by the suspect
Thieves hauled away a safe weighing nearly 300 kilograms and containing 150 million yen in cash
Suspect said, 'It is not permissible for a Yamaguchi-gumi office to be in Matsuba-kai territory'
Impact into the structure heavily damaged the front door and a brick wall, police said
Victim told police, 'When I looked back, I saw [the suspect] with a knife'
Suspect, who pointed a handgun at arresting officers, said: 'I fired about 30 rounds'
On Tuesday, police raided an office of Teruya-ikka in Naha City in search of evidence in the case
Tokyo police raided an office of a Kodo-kai affiliate in Gifu City on Thursday
Suspect denies the allegations, telling police, 'I didn't say anything that could be construed as a threat'