According to Soeul police, the 27-year-old Jonhyun was found unconscious at his house about 6:45 pm, Korean time.
Emergency responders immediately brought the singer to the hospital but was declared dead on arrival by attending physicians.
Reports from Soompi said the police arrived at the scene after Jonghyun’s older sister filed a disappearance report.
His sister reportedly received a text from Jonghyun that led her to believe he would be attempting to commit suicide.
In the text, he said, “It has been really hard. Let me go. Tell me I did well. This is my last goodbye.”
Police found traces of burnt coal at his living room, leading them to suspect the death was by suicide.
However, police are still investigating the matter and have not confirmed the cause of death.
Jonghyun’s agency, SM Entertainment, reportedly cannot be reached at the moment.