Cause of death according to officials was cardiac arrest.
TMZ:
Michael suffered a cardiac arrest earlier this afternoon at his Holmby Hills home and paramedics were unable to revive him. We're told when paramedics arrived Jackson had no pulse and they never got a pulse back.
A source tells us Jackson was dead when paramedics arrived. A cardiologist at UCLA tells TMZ Jackson died of cardiac arrest.
Once at the hospital, the staff tried to resuscitate him but he was completely unresponsive.
RIP
.