K-pop fans are mourning a tragic loss.

Wheesung—a singer and songwriter whose real name was Choi Whee-sung—was found dead in his home in Seoul, South Korea, March 10, per his agency Tajoy Entertainment. He was 43.

“The artist Wheesung has left us,” the agency shared in a statement, per The Hollywood Reporter. “He was found in cardiac arrest at his residence and was later pronounced dead.”

The statement added that the company’s artists and staff are “in deep sorrow.”

According to The New York Times, fire department officials confirmed the musician was found in a state of cardiac arrest. Additionally, the outlet reports there was no evidence of foul play or a break-in, and authorities are investigating the possibility of a drug overdose, per an officer at Seoul Gwangjin Police Station.

Wheesung entered the music scene in 2002 with his album Like a Movie, which won several awards in South Korea at the time of its release. In the years since, Wheesung released a dozen albums, helped write music for K-pop bands such as Twice and Super Junior, and performed in musical theater with roles like Zorro and Elvis Presley.