I also want to make this comment, because I believe there is some confusion in some people's minds. Cause of Death, Mechanism of Death and Manner of Death are all very different things.
Cause of Death: This is basically the physiological condition which caused the death. Example: massive coronary, drug overdose, gunshot wound to the head, etc.
Mechanism of Death: This is the physiological condition which results from the cause of death. Example: massive hemorrhage, respiratory failure, liver failure, etc.
Manner of Death: This is basically a professional explanation for how the death came about. Natural death, accidental death, suicide, homicide, etc. Example: Let's say the cause of death in a particular case was a gun shot wound to the head. The mechanism of death might be massive hemorrhage, and the manner of death might be accidental death, suicide, or homicide, depending on what the evidence of the investigation points to.
This is, of course, a very basic explanation of the differences, but I just wanted to take a moment to clarify these terms, so that everyone understands what they actually mean when they hear them in this case.