Natural causes refers to foul play or criminal activity, by stating that she died of natural causes, we understand that Brittany did not die
from a gunshot wound, or visible trauma to the body. That doens’t mean, however, that a drug overdose may not be involved.
Elvis Presley died from natural causes but it was determined that he had a vast drug cocktail that contributed to his cardiac arrest. The remainder of testing will be for the purpose of determining the cause of death and finding out why Brittany Murphy suffered a cardiac arrest at 32 years old.
check out : http://wiiwant2help.com