of/from natural causes

:  based on an inherent sense of right and wrong

:  being in accordance with or determined by nature

:  having or constituting a classification based on features existing in nature

:  one born without the usual powers of reason and understanding

:  a sign ♮ placed on any degree of the musical staff to nullify the effect of a preceding sharp or flat

:  a note or tone affected by the natural sign

:  a reason for an action or condition :  motive

:  something that brings about an effect or a result

:  a person or thing that is the occasion of an action or state

:  to serve as a cause or occasion of

:  to compel by command, authority, or force