What's the difference between accidental death and death due to natural causes?

Death can occur as a result of natural causes or it can be accidental.  What is the difference?

A natural death is one that occurs as a result of the aging process or disease. Some examples of natural causes include heart attack, stroke, organ failure, or cancer.

An accident is an event that a person has no control over, and the person was not prepared for it or expecting it. The accident must be the direct and only cause of death. Examples of accidents are car crashes or drowning.