Kim Jong-hyun, member of popular K-pop group SHINee has died in an apparent suicide. He was 28.

Kim, better known by his stage name Jonghyun, was found unconscious in a rented studio apartment in Cheongdam-dong, Southern Seoul on Monday. According to the police, he was moved to a nearby hospital but was later pronounced dead.

Investigators believe Kim died from inhaling toxic fumes, as they discovered coal briquettes burnt on a frying pan upon arriving at the apartment. His sister had called 119 saying she thought her brother was committing suicide.

Kim debuted in May 2008 as the main singer of SHINee under S.M. Entertainment, and has boasted a nearly decade-long prolific career not just in group activities but as a solo singer-songwriter.