Music icon and pop superstar Michael Jackson died Thursday afternoon after suffering a cardiac arrest. He was 50.

Michael Jackson was found to be not breathing after fire fighters responded to a 911 call. The singer was transferred to UCLA Medical Center in Los Angeles and later pronounced dead due to cardiac arrest.

His brother Jermaine Jackson confirmed Jackson’s death from suspected cardiac arrest at a press conference Thursday evening.

Jackson was busy preparing for his greatest comeback. He was scheduled for an unprecedented 50 shows in England, with the first set for July 13 and tickets selling out quickly.

His sudden death stunned the industry and millions of fans around the world.