Daisuke Mori / Japanese Serial Killer / Medical Murder

Daisuke Mori | Japanese Serial Killer

Daisuke Mori
Daisuke Mori

Daisuke Mori

Born: 04-28-1971


Medical Murderer

Japanese Serial Killer

Crime Spree: 2000

Life Sentence: 03-30-2004


Nurse Daisuke Mori had obviously been using the institutionalized unaccountability to hide a sadistic pattern of murder. After the 29-year-old nurse began working at the 18-bed Hokuryo Clinic in March of 1999, at least eight patients died under strange circumstances, including a five-year-old boy with asthma who expired in the clinic while his mother had returned home to collect clean clothes for him.

Suspicions Aroused

Police suspect 11 other patients also worsened after nurse Daisuke Mori handled their intravenous drips. He had also aroused suspicions among his own colleagues, who nicknamed him “Fast-Change Mori” because the condition of his patients often reversed course quickly, and dramatically, without a reasonable explanation.

Sloppy record-keeping of drug supplies apparently was blamed for not discovering Mori’s alleged misdeeds earlier. Clinics of that size are required by law to employ a full-time pharmacist, but Hokuryo didn’t have one on staff for two years.

When Dr. Handa, the clinic’s deputy director, finally inspected the pharmacy cabinet in November of 2000, she discovered a dwindled inventory of the muscle relaxant. This was odd, because the clinic had used it in only 10 surgeries that entire year. But, despite Handa’s suspicions, she continued to let Mori work at the clinic for the time being. However, two weeks later, she did informed the authorities of her suspicions and an investigation began.

Two days after the police began their investigations, Mori was fired. When he attempted to leave with his belongings he also tried to take empty ampoules from the clinic. These ampoules were tested, and traces of vecuronium, the primary ingredient of muscle relaxant, were detected.


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Daisuke Mori

On January 6, 2001, Daisuke Mori, then 32, was arrested and charged with the murder of Yukiko Shimoyama, 89.  He was also charged with four counts of attempted murder of a 1-year-old girl, an 11-year-old girl, a 4-year-old boy and a 45-year-old man. 

Prosecutors say Mori administered a muscle relaxant to his victims, his patients, through an intravenous drip, implying that he replaced a bag that was prepared by other nurses with one that contained the lethal doses of the muscle relaxant he had prepared. The alleged attacks occurred between February and November 2000, yet Mori pleaded not guilty to the charges. There were no witnesses to the alleged acts.

Although Mori was convicted of only one murder, he is suspected to be a medical serial killer.

The district court in Sendai sentenced him to life imprisonment on March 30, 2004 for one murder and four attempted murders. Mori appealed to the Supreme Court, but they too upheld the sentence on February 25, 2008.

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