From Billboard:
Swedish DJ Avicii, real name Tim Bergling, died at age 28 on Friday, April 20, his publicist confirmed.
“It is with profound sorrow that we announce the loss of Tim Bergling, also known as Avicii,” his publicist Diana Baron said in a statement. “He was found dead in Muscat, Oman this Friday afternoon local time, April 20th. The family is devastated and we ask everyone to please respect their need for privacy in this difficult time. No further statements will be given.”