Kenneth Law, a 60-year-old former aerospace engineer, pleaded guilty in a Canadian court Friday to his role in 14 fatal poisonings. Investigators say Law shipped over 1,200 packages, mainly to the UK and US, linked to at least 131 deaths worldwide.

Aimee Walton would have turned 25 on Monday. In 2022, she took her own life after being groomed on an online pro-suicide forum. Her sister Adele met Prime Minister Keir Starmer Tuesday, pressing for a full public inquiry into nearly 100 preventable deaths.

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“The scale of Kenneth Law’s crimes in the UK could make him one of the most prolific mass killers in British modern history,” Adele Walton said. “It’s insane that no one is really talking about that.”

Beginning in 2020, Law sold a toxic substance under the guise of an industrial food wholesaler, including hot sauces, and provided detailed suicide instructions. Families say they were ignored by police for years. Tom Parfett’s father Dave, who traced his son’s death in 2021 to Law, obtained the same poison in under three months. “It was too easy,” he said.

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Law could face up to 14 years in prison under Canadian law, with the UK deaths also considered in sentencing. Campaigners warn the toxic substance remains available online, and that regulators have failed to act despite dozens of coroner warnings.