Stein-Erik Soelberg killed his mother and himself in Connecticut earlier this month, with the Wall Street Journal reporting that ChatGPT fuelled his irrational fears about her. Meanwhile, a couple in California has filed a lawsuit against OpenAI after the suicide of their son, accusing ChatGPT of helping him do it. In this week's Tech 24, we explore what's behind the increase in tragic stories that's accompanied the boom in people talking to AI chatbots.