Tsutomu Miyazaki, convicted of murdering four girls aged 4 to 7 in Tokyo and Saitama Prefecture in the late 1980s, was executed on Tuesday, Justice Ministry officials said.
Miyazaki, 45, was hanged at the Tokyo Detention Center two years and four months after his death sentence was confirmed by the Supreme Court and 20 years after he committed the first murder.
The focal point during his court hearings was whether he was mentally stable enough to be held responsible for his crimes.
He repeated incomprehensible statements during his court hearings.
"I feel as if I committed the crimes in my dreams," he said in one of his hearings.
"I was scared because a 'rat person' appeared. My alter ego suddenly appeared and committed the acts," he said on another occasion.
The results of psychiatric evaluations conducted on him during the district court trial were divided.
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