The musician was reportedly found unconscious in an apartment in Seoul, South Korea.
Family, friends and fans of Jonghyun, whose full name is Kim Jong-hyun, are in mourning after the singer died suddenly on Monday. He was 28.
Jonghyun, who was one of the five members of the Korean pop band Shinee, was taken to the hospital after he was found unconscious in an apartment in Seoul, South Korea, according to multiple reports.
AFP reports that Jonghyun's sister alerted emergency services after she received several concerning text messages, including one that read: "This is my last farewell."
Police told the BBC that Jonghyun's death will be investigated as a possible suicide.
Jonghyun gained fame in 2008 when he joined Shinee, and went on to pursue a solo career in 2015.
News of the Korean pop star's death comes just a few weeks after news broke that Lil Peep had died. It was later revealed in the toxicology report that the rapper had overdosed on Xanax and Fentanyl.
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