Swedish DJ Avicii, real name Tim Bergling, was found dead in Muscat, Oman at age 28, and the 2AM sent his regards as they previously collaborated for an album. On April 20, Jo Kwon posted to Instagram, "R.I.P @avicii. I'm very sad to hear the news of Avicii's passing. He wrote the tracks for the song 'Animal', which was a single in my first solo album. It was a privilege to work with him."
Rest in peace, Avicii, and condolences to his family.