Zhu Ling ( 24 April 1973 – 22 December 2023) was best known as the victim of an unsolved 1995 thallium poisoning case in Beijing, China. Her symptoms were posted to the Internet via a Usenet newsgroup by her friend from Peking University, Bei Zhicheng, and were subsequently proven to be caused by thallium poisoning. Her case was then reviewed by physicians in many different countries who examined ... Wikipedia