Korean pop star, Kim Jonghyun, asked his older sister to "let him go" shortly before his tragic death at the age of 27.
Yonhap news agency said authorities found burned coal briquettes, which produce carbon monoxide, in a frying pan in Kim's hotel room.
Kim debuted in May 2008 as the main singer of SHINee under S.M. Entertainment, South Korea's biggest music label and entertainment agency, and has boasted a almost decade-long prolific career not just in group activities but as a solo singer-songwriter.
His fans posted messages of grief on his account after the news of his death broke. Please send me off. Tell everyone I've had a hard time. They released six chart-topping albums in Korea and five in Japan, in addition to embarking on numerous world tours.
K-pop's success has also been dependent on a highly-polished image.
Kim debuted in 2008 as the main singer of SHINee, and cultivated a career as both a group member and a solo singer-song writer.
SHINee have been dubbed the "Princes of K-pop" - a musical genre that started in South Korea and that mixes electronic, hip hop, pop, rock, and R&B music.
K-pop emerged in South Korea in the early 1990s, and labels such as JYP, DSP and YG built the nation's pop industry from the ground up, creating a training scheme that churned out stars for music, soap operas and movies.