On 30 October 2017, Kim was involved in a fatal car accident that reportedly took place around 4:30 p.m. KST in Samseong-dong, Gangnam-gu, Seoul.
His car overturned, and he was taken to Konkuk University Hospital.
According to the police and Konkuk University Medical Center, It seems the accident occurred after he showed symptoms of a myocardial infarction.
However, it was later stated by the police that the actor showed no signs of having a heart attack. He was pronounced dead two hours after arriving due to a fatal head injury.
Kim, whose father was also a famous actor, made his debut in 1999 and quickly gained popularity for his roles in several romantic comedies, earning himself the nickname.