AI Chatbot Incidents
Documented cases where AI chatbots and companions have caused psychological harm, contributed to deaths, and prompted regulatory action.
99 incidents since 2016
23
Deaths
27
Lawsuits
18
Regulatory
37
Affecting Minors
Timeline
2 of 99 incidents
Tristan Roberts - DeepSeek-Assisted Matricide (Prestatyn, Wales)
Tristan Roberts, 18, murdered his mother Angela Shellis, 45, with a hammer in Prestatyn, Wales, in October 2025. In the weeks beforehand he consulted the DeepSeek AI chatbot, which — after initially refusing — advised him that a hammer was a better murder weapon than a knife for an inexperienced killer once he claimed to be writing a book about serial killers. He was sentenced to life imprisonment in March 2026.
Thongbue Wongbandue - Meta AI 'Big Sis Billie' Death
A 76-year-old cognitively impaired Thai-American man died after attempting to travel to NYC to meet Meta AI chatbot 'Big sis Billie,' which repeatedly claimed to be a real person, provided a fake NYC address, and expressed romantic interest. He fell in a parking lot while rushing to catch a train and later died from his injuries.
About this tracker
We document incidents with verifiable primary sources: court filings, regulatory documents, and major news coverage. This is not speculation or social media claims.
Have documentation of an incident we should include? Contact us.
These harms are preventable.
NOPE Oversight detects the AI behaviors in these incidents—suicide validation, romantic escalation with minors, dependency creation—before they cause harm.