Following the fatal car accident on October 30, the doctor from Konkuk University Medical Center named myocardial infarction (heart attack) as the leading cause of Kim Joo Hyuk's death. However, police claim that isn't the case based on the results from the autopsy.

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According to an official from Gangnam Police Station, myocardial infarction is not the cause of Kim Joo Hyuk's death. The autopsy shows the true cause leading to the actor's sudden death was actually a traumatic head injury. However, there's still a chance an issue in the heart and/or possible drug consumption played a role in his death. Tissue examination is needed in order to detect the exact cause. The results of the tissue examination will be available in about week.