Bruce Lee is seen in a still from Fist of Fury.Photo: Criterion Collection.Bruce Lee died from drinking too much water, new study claims- Brain swelling was ruled as cause of death, but researchers say real reason may have been hyponatraemia, when a person cannot get rid of water fast enough- Martial arts star drank a lot of fluids, including alcohol and juice, and also had a kidney injury, both risk factors for the conditionBruce Lee is seen in a still from Fist of Fury."