One of the things the experts will try to determine is whether whether prescription drugs played a role.
A family friend and former Jackson attorney says he was concerned about Jackson's use of painkillers. Brian Oxman tells NBC's "Today'' show that he warned Jackson's family about possible abuse.
Oxman says he doesn't know what killed the singer, but he says, "I feared this day.''
Jackson was pronounced dead at UCLA Medical Center after being stricken yesterday at his rented home in Los Angeles.
His brother Jermaine said it's believed that Jackson suffered cardiac arrest, which can occur after a heart attack or be caused by other heart problems.
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Grammy Award-winning artist Alicia Keys is heating things up in Rio de Janeiro during the filming of a music video for her song "Put It In a Love Song."