A San Francisco woman named Yu-Ping Xie died after consuming toxic tea from an herbal remedy shop in Chinatown. Within an hour of drinking the tea, she and an unidentified male victim experienced weakness and irregular heart rhythms. Aconite, a deadly plant-based toxin, was found in traces of the tea and in the victims' lab tests. It is used in Asian herbal tea remedies and is known to have healing qualities, but it left unprocessed it can pose fatal risks. The city's health officials are warning residents to stay clear of the company that sells the tea products, and that there is no antidote for the toxin.