The brutality of the attacks drastically altered Furuta's appearance. Her face was so swollen that it was difficult to make out her features. Her body was also severely crippled, emitting a rotten smell, causing the four young men to lose sexual interest in her.
On January 4, 1989, Junko was challenged to play mahjong. After losing a game, Hiroshi Miyano decided to vent her anger on Furuta. At this point, she Furuta was barely alive. Out of her frustration, the boys beat her with an iron bar, kicked and beat her, and placed two short candles on her eyelids, burning them with the hot wax. They stood her up and beat her feet with a stick. At this point, she fell onto a stereo unit and collapsed in a seizure fit. As she was bleeding profusely and her pus was emerging from her infected burns, the four boys covered their hands with plastic bags, which were taped to her wrists. They kept hitting her and dropped an iron exercise ball on her stomach several times. Lighter fluid was poured over her thighs, arms, face, and stomach and once again set on fire. Furuta supposedly made attempts to put out the fire, but she gradually stopped responding. The attack reportedly lasted two hours. Furuta eventually succumbed to her injuries and she died that day.