Kim Jong Hyun, better known by the mononym Jonghyun, was a South Korean singer-songwriter, and radio host. He was a vocalist of the South Korean boy group SHINee, and further participated in S.M. Entertainment's project group S.M. The Ballad. He and the rest of the SHINee members debuted in 2008. Jonghyun had been active in music since he was in junior high school.

He was in a band and participated in many festivals in this area. The band's name was "ZION" and during one of its shows, he was scouted by SM.
Jonghyun debuted as a solo artist on January 12, 2015, with his first EP, titled Base. Later that year he released "Story Op.1". In 2016 Jonghyun released his "She is". In 2017 he released "Story Op.2", with the title track reaching on music charts.

On October 27, 2010, SM Entertainment confirmed that Jonghyun and actress Shin Se Kyung were dating. However, on June 20, 2011, that the couple was reported to have split up because of their busy schedule.
In April 2013, Jonghyun was involved in a car accident, causing him to injure his nasal bone. It was reported by his agency that he had received surgery on the injury. Jonghyun sat out most of his group's promotions for their third full-length album to focus on recovery, though he rejoined for the final week.

According to the police, Jonghyun was found unconscious at a rented apartment studio on December 18, 2017. Earlier, his older sister made the initial call to emergency responders at 16:42, reporting that she believed her brother was committing suicide. He reportedly sent a number of text messages to his sister with words such as "last goodbye". He was rushed to the hospital in a state of cardiac arrest and received emergency CPR treatment, but failed to regain consciousness, and was pronounced dead at the hospital. He was 27 at the time of death. Investigators believe he died from inhaling toxic fumes, as they discovered coal briquettes burnt on a frying pan upon arriving at the apartment.
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