被止痛片成分的副作用，死于甲丙氨脂的过敏反应：
On May 10, 1973, Lee collapsed during an automated dialogue replacement session for Enter the Dragon at Golden Harvest film studio in Hong Kong. Because he was having seizures and headaches, he was immediately rushed to Hong Kong Baptist Hospital, where doctors diagnosed cerebral edema. They were able to reduce the swelling through the administration of mannitol. The headache and cerebral edema that occurred in his first collapse were later repeated on the day of his death.
On Friday, July 20, 1973, Lee was in Hong Kong to have dinner with actor George Lazenby, with whom he intended to make a film. According to Lee's wife Linda, Lee met producer Raymond Chow at 2 p.m. at home to discuss the making of the film Game of Death. They worked until 4 p.m. and then drove together to the home of Lee's colleague Betty Ting Pei, a Taiwanese actress. The three went over the script at Ting's home, and then Chow left to attend a dinner meeting.
Later, Lee complained of a headache, and Ting gave him the painkiller Equagesic, which contained both aspirin and the tranquiliser meprobamate. Around 7:30 p.m., he went to lie down for a nap. When Lee did not come for dinner, Chow came to the apartment, but he was unable to wake Lee up. A doctor was summoned, and spent ten minutes attempting to revive Lee before sending him by ambulance to Queen Elizabeth Hospital. Lee was declared dead on arrival at the age of 32.
There was no visible external injury; however, according to autopsy reports, Lee's brain had swollen considerably, from 1,400 to 1,575 grams (a 13% increase). The autopsy found Equagesic in his system. On October 15, 2005, Chow stated in an interview that Lee died from an allergic reaction to the tranquiliser meprobamate, the main ingredient in Equagesic, which Chow described as an ingredient commonly used in painkillers. When the doctors announced Lee's death, it was officially ruled a "death by misadventure".