A chilling tale of professional jealousy and calculated malice unfolded at the University of Wisconsin-Madison, culminating in felony charges against a research scientist. Makoto Kuroda, 41, allegedly poisoned a colleague, driven by resentment over a perceived shift in their relationship following a promotion.
The victim, known only as TM in court documents, was once a close friend of Kuroda’s. However, Kuroda believed TM’s attitude changed after receiving a promotion, fostering a sense of superiority. This simmering resentment ultimately boiled over into a deliberate act of harm.
Kuroda confessed to contaminating TM’s water bottle and even his shoes with a cocktail of dangerous chemicals: chloroform, paraformaldehyde, and Trizol. He then delivered a stark admission of guilt, leaving a note for his colleague written in Japanese simply stating, “I did it.”
The scientist’s access to a wide range of toxic substances, a consequence of his research on viruses like Ebola and COVID-19, proved instrumental in carrying out his plan. He had dedicated years to studying these pathogens, ironically possessing the very means to inflict harm.
Disturbingly, Kuroda reportedly turned to artificial intelligence in the days before the poisoning. Police reports indicate he used ChatGPT to determine the “harmful amount” of PFA and Trizol for both humans and animals, meticulously planning the dosage.
The catalyst wasn’t a single dramatic event, but a series of perceived slights. Kuroda expressed frustration over TM’s failure to consistently wear proper lab safety gear, but the promotion served as the primary trigger for his escalating anger.
He described a subtle but significant change in TM’s demeanor, alleging that his colleague began to treat those he considered “subordinates” with disdain and favor those in positions of authority. This perceived shift in power dynamics fueled Kuroda’s resentment.
Even seemingly minor interactions became sources of offense. Kuroda recounted an incident where TM walked in front of him in a hallway, failing to yield, and then audibly discarded trash, actions he interpreted as intentional disrespect. These accumulated grievances, he claimed, drove him to act.
Kuroda admitted to using half a milliliter of a four percent PFA solution in TM’s water, explicitly stating he didn’t intend to cause fatal harm. His stated goal was simply to make his colleague “feel bad,” a chillingly understated description of his actions.
When questioned about the potential for TM’s death, Kuroda remained silent for a prolonged period before offering a hesitant, remorseful response: “I, I shouldn’t do that.” This moment revealed a flicker of regret, but did little to diminish the gravity of his actions.
Following the incident, Kuroda confessed to both TM and a Japanese-speaking colleague, YK, leaving a handwritten letter to YK acknowledging his guilt and expressing his apologies: “I did it. I have also informed the person himself. I am very sorry.”
Prosecutors have charged Kuroda with second-degree recklessly endangering safety and tampering with household products. A conviction on both counts could result in a prison sentence of up to 16 years and fines exceeding $35,000, a stark consequence for a betrayal born of professional envy.
