A 70-Year-Old Japanese Woman’s Courtroom Outcry After Killing Her 102-Year-Old Mother

1. Overview

In July 2025, a 71-year-old daughter killed her 102-year-old mother, who had dementia, at their home in Kunitachi, Tokyo. The case drew attention as an example of the realities of caregiving in Japan’s super-aged society: the perpetrator, Yoko Komine, had cared for her mother alone for 12 years before reaching her limit and committing the crime.

The basic outline of the case is simple. Komine injured her back while carrying her mother to the toilet every 10 minutes each night. During this process, her mother fell out of bed, but Komine was unable to lift her back up on her own. After the story became known, the case was often cited as a typical example of caregiving in which “there is no time, rather than no money.”

2. How Caregiving Began and Broke Down

Komine worked as a bank employee, had two sons, and divorced in her 40s. In 2012, at age 58, she returned to her family home at her mother’s request and cared for both of her parents. After her father died in 2021, she and her mother, then 99, continued living together. Her mother later became almost unable to move around.

There are reports that her mother’s urination frequency had noticeably increased about a week before the incident. Her mother refused to use diapers, so Komine had to carry her each time to a portable toilet beside the bed. Because their weights were not very different, the repeated movement put increasing strain on Komine’s back. After consulting a care manager, Komine decided to place her mother in a care facility, with admission scheduled for around the time of the incident.

3. Events on the Day of the Incident

The incident occurred at around 4 a.m. on July 22, 2025. Her mother fell out of bed, but Komine could not lift her because of her back pain. She initially called the police, then asked the emergency services for help by calling 119. Paramedics came and put her mother back in bed. As they left, they reportedly said something to the effect of, “Don’t call us about something like this again.” This may have been a matter-of-fact explanation to the responders, but it was reportedly taken heavily by Komine, who was exhausted from years of caregiving.

Komine then strangled her mother and stabbed her with a knife, killing her. Prosecutors argued that these were highly dangerous acts intended to ensure her death.

4. Trial and Verdict

On November 17, 2025, the Tokyo District Court’s Tachikawa Branch sentenced Komine to three years in prison, suspended for five years. This was less than the eight-year prison term sought by prosecutors. While pointing out the danger of her actions, the court ruled that the burden of effectively providing care alone for 12 years was not insignificant, and that the incident had occurred in circumstances that exceeded the defendant’s ability to cope.

At trial, Komine testified, “I thought I had to handle it all by myself, and I convinced myself that I had no choice but to kill her.” She also said, “I wanted her to pass away naturally from illness or old age, and I’m sorry that she ended up being killed by her daughter.” After the verdict, Komine was placed under probation.

5. Authenticity Debate

The central question surrounding the case is: “Was this an unavoidable tragedy, or a verdict that obscures responsibility?”

5.1. The View That the Case Was Caused by Social Structures

This perspective attributes the cause of the incident not to personal violence but to gaps in the caregiving system. It argues that the lack of an adequate social response is evident in the fact that Komine had already reached the point of deciding to place her mother in a care facility, and that a brief remark from the emergency responders drove her into isolation. In light of the 12-year burden emphasized in the verdict, this view holds that placing all the blame on an individual is unconvincing.

5.2. The View That the Sentence Reduction Was Excessive

The opposing view holds that the verdict sends a signal that human life is being treated lightly. Reports indicated that there was no evidence that the mother had been physically or verbally abusive, and prosecutors argued that strangling her and then stabbing her again was closer to planned murder than an impulsive act. Concerns have been raised that a suspended sentence could spread the idea that “if caregiving is hard, it is acceptable to kill.” From this perspective, empathy for someone’s suffering must be distinguished from condoning murder, and using shortcomings in support systems as grounds for a reduced sentence obscures responsibility.

6. Trivia

• In Japan, killings of family members providing care are often discussed under the issue of “elderly caring for elderly” (rōrō kaigo). This case is also mentioned in that context.
• The expression “The Night in Tachikawa,” used as the case’s name, comes from the name of the Tokyo District Court’s Tachikawa Branch, where the trial was held.