Swedish DJ Avicii, one of the world’s most successful electronic dance music artists and subject of an upcoming biopic, has been found dead in Muscat, Oman at the age of 28.

The popular artist, who had retired from performing live in 2016 after five years of astronomical success, was the subject of a 2017 documentary, Avicii: True Stories, which was due for release on Netflix sometime in 2018. The biopic is a chronicle of the rise, fall and comeback of Avicii, born Tim Bergling, detailing health scares such as acute pancreatitis, in part due to excessive drinking, which led to the removal of his gallbladder and appendix several years ago.

Several months ago, filmmaker and longtime Avicii friend Levan Tsikurishvili told Variety, “Young people can learn from this movie, that life can look exciting and glamorous on Instagram and social media, but you don’t really have any idea what’s going on behind that.”

During an interview with People magazine several years ago, the entertainer spoke of the toll touring had taken on him. “I’m tired, really tired,” he said. “I’ve been at it since I was 17, 18 years old, touring pretty much nonstop, 300 shows a year.”

Among Avicii’s biggest hits: “Levels,” “Wake Me Up” and “Hey Brother.”