Mexican singing superstar Juan Gabriel died of a massive heart attack in Santa Monica, California, on Aug. 28. He was 66.

Gabriel was in the middle of the U.S. leg of his “MeXXico Es Todos” tour. He ranked in the top 20 on Billboard’s 2015 Money Makers list, thanks largely to his touring revenue.

In 2014, Queerty reported that Gabriel surprised fans by uploading a video of himself intimately lounging with a mysterious man in a hotel room. Fans and media outlets have long said Gabriel (who had four children but never married) was gay, but he has only answered the question once formally, telling a Univision reporter, “Don’t ask about something that is obvious.”

Among his many albums were Con Tu Amor, Mis Ojos Tristes, Por Mi Orgullo and the self-titled Juan Gabriel.