A new study claims to have solved the mystery of actor Bruce Lee’s death, suggesting the martial arts legend may have died from drinking too much water.

The Enter The Dragon star passed away aged 32 in Hong Kong in July 1973, with doctors ruling the cause of death at the time as brain swelling. However, a study published in the December issue of the Clinical Kidney Journal suggests Lee died “from a specific form of kidney dysfunction: the inability to excrete enough water.” Researchers from Madrid, Spain, say Lee likely died from hyponatraemia, which is when an “abnormally” low concentration of sodium is in the blood, which can be caused by too much water in the body. 

“In other words, we propose that the kidney’s inability to excrete excess water killed Bruce Lee,” the team of researchers wrote in the Clinical Kidney Journal.

They said several factors suggest he had been consuming high quantities of water, such as his wife Linda referring to a fluid-based diet including carrot and apple juice and his biographer, Matthew Polly, repeatedly referring to water intake on the day of his death and just before he became noticeably ill.

“The fact that we are 60% water does not protect us from the potentially lethal consequences of drinking water at a faster rate than our kidneys can excrete excess water.”